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sink (one's) teeth into (something)

To start doing or become involved in something with one's utmost energy, determination, or enthusiasm. I'm always looking for a great book to sink my teeth into. I'd like you to sink your teeth into this new project I'm developing.
See also: sink, teeth

heart sinks

(One) feels disappointed or disheartened. My heart sank when I saw that the meal I'd spent all day preparing had burned in the oven.
See also: heart, sink

be sunk in (something)

To be fully and deeply engrossed in a thought or idea, perhaps because one is feeling melancholy. It's no use trying to talk to Helen when she's sunk in thought like that. It's as if we don't even exist!
See also: sunk

sink in

1. To penetrate, absorb, or soak in (to something). It takes a few hours for the mixture to sink in. If the water sinks in, it could cause your floorboards to warp or even rot.
2. By extension, to become understood; to make a lasting impression or memory. The gravity of what happened in this field 200 years ago didn't sink in until we saw actors recreating the war as it would have been fought. No matter how many times I go over it, this equation just isn't sinking in.
See also: sink

sink into

1. To penetrate, absorb, or soak into something. If the water sinks into the floorboards, it could warping or even rot. It takes a few hours for the mixture to sink into the skin.
2. To enter into some passive, non-functional state. Within seconds I had sunk into a deep, dreamless sleep. After staring at the swinging watch, she sank into a hypnotic trance.
3. To force, press, or impale something into someone or something. In this usage, a noun or pronoun is used between "sink" and "into." He sank the blade into the body of his enemy. The farmer sank the stakes of the fence into the ground with several swings of her sledgehammer.
4. To expend time, money, or other resources into someone or something as an investment, especially when those resources were or seem to have been squandered. In this usage, a noun or pronoun can be used between "sink" and "into." By the time the product was finally released onto the market, there was simply no way for the company to earn back what they had sunk into it. We sank a lot of hours into creating this program—if it doesn't work, I'm going to be very disappointed. The company sank so much money into me, between the training courses and masters degrees they paid for, that I feel guilty quitting.
See also: sink

sink below (something)

1. Literally, to go beneath the surface of water or some other liquid. The storm punched a hole in the hull of the vessel, causing it to sink below the waves. You might expect such a heavy object to sink below the surface of any liquid, but because it is less dense than mercury, it actually floats on top of it.
2. To move or appear to move beneath or behind some object or boundary. We sat watching the sun sink below the horizon. The child sank below the table to avoid having to talk to the people his parents had invited for dinner.
3. To reach or go to a level or degree beneath some point or threshold. Temperatures are expected to sink below freezing tonight, so beware of icy roads in the morning. We can't let the power output sink below 500 kilowatts.
See also: below, sink

sink down

1. To fall or lower (oneself), as due to exhaustion, weakness, despair, etc. I came in the door and sank down onto the sofa, totally wiped from such a long day at work. I sank down to the floor and cried when I heard the news that Michael had died.
2. To move or appear to move to a lower position or location. We sat watching the stars begin to appear as the sun sank down in the sky. I sank down in my chair, trying to tune out the sound of my parents arguing.
See also: down, sink

sink into despair

To enter into a state of utter hopelessness, helplessness, and depression. I sank into despair when I was told I hadn't gotten the job. We can't sink into despair just because our sales figures weren't what we were hoping for—we've got to pick ourselves up and do what is necessary to get back on track!
See also: despair, sink

sink into depression

1. To enter into a cognitive state characterized by an inability to experience pleasure as well as feelings of hopelessness, helplessness, and despondency; to become clinically depressed. Despite how many things were going well for me, I could feel myself sinking into depression again. She closed herself off from her friends and family, and the isolation caused her to sink further into her depression.
2. To enter into a period of drastic economic decline, widespread poverty, and high unemployment. Eventually the entire subprime mortgage market collapsed, causing economies around the world to sink into depression. The small country sank into depression shortly after gaining its independence.
See also: depression, sink

sink into oblivion

1. To become lost to obscurity; to not be known or remembered by anyone. The poet sank into oblivion after the war, only coming back into public awareness after an archive of his works was discovered in the basement of an abandoned warehouse in East Germany. He held a rather cynical view of parenthood, believing that people only had children to avoid sinking into oblivion.
2. To enter into total unconsciousness. The last thing I remember was the doctor asking me to count to ten before the general anesthetic took effect and I sank into oblivion. He was so utterly exhausted that he sank into oblivion the moment my head hit the pillow.
See also: oblivion, sink

sink to (something)

1. To fall, descend, or collapse to some lower point or level. The boat was struck with another torpedo, and it sank to the bottom of the sea. They've run out of fuel, but so long as they don't encounter any strong winds, their hot air balloon should sink safely to the ground. I sank to the floor in shock when they told me that Michael had been killed.
2. To appear to move to some lower point or level. We sat watching the stars beginning to appear as the sun sank to the horizon.
3. To move or shift to some lower measurement or degree. The temperatures are supposed to sink to -10 degrees tonight! The power station's output sank to just over 200 megawatts.
4. To engage in some negative action or behavior that one or others believe is below a certain standard of dignity, principles, or integrity. Don't sink to his juvenile taunts. Just ignore him. I can't believe he would sink to spreading lies about me like that. I lost faith in the news site when they sank to posting vacuous, clickbait-driven articles.
See also: sink

sink under (something)

1. To fall or submerge beneath some surface. The boat was struck with another torpedo, and it sank under the waves. The frozen lake became unstable, and the man sank under the ice.
2. To fall, descend, or collapse due to some downward pressure or force. The entire roof sank under the strain placed on it by the accumulating snowfall. The hot air balloon began to sink under the weight of so many people.
See also: sink

sink down

to sink or submerge. The sun sank down and darkness spread across the land. She sat in the chair and sank down, enjoying her moment of relaxation.
See also: down, sink

sink in

1. Lit. to sink, submerge, or descend into something. How long will it take the water to sink in? It might take days for the oil to sink in, so you have time to clean it up.
2. Fig. [for knowledge] to be understood. I heard what you said, but it took a while for it to sink in. I pay careful attention to everything I hear in calculus class, but it usually doesn't sink in.
See also: sink

sink into despair

to become depressed; to become completely discouraged. After facing the hopelessness of the future, Jean Paul sank into despair. Mary sank into despair upon learning of the death of her grandmother.
See also: despair, sink

sink into oblivion

Fig. to fade into obscurity. She may be famous now, but in no time she will sink into oblivion. In his final years, Wally Wilson sank into oblivion and just faded away.
See also: oblivion, sink

sink something in (to) someone or something

 and sink something in 
1. Lit. to drive or push something into someone or something. The brave hero sank the wooden stake into the vampire. The hero sank in the stake.
2. Fig. to invest time or money in someone or something. (Sometimes implying that it was wasted.) You would not believe how much money I've sunk into that company! She sank in a lot of money, but it was all wasted.
See also: sink

sink in

Penetrate the mind, be absorbed, as in The news of the crash didn't sink in right away. [Late 1300s]
See also: sink

be ˈsunk in something

be in a state of unhappiness or deep thought: She just sat there, sunk in thought.
See also: something, sunk

sink in

1. To seep or soak; penetrate: When the floodwaters sink in, the ground will become soft.
2. To make an impression; become felt or understood: The meaning of the poem finally sank in after I had thought about it for a while.
See also: sink

sink into

1. To pass into some condition: She sank into a deep sleep.
2. To seep or soak into something; penetrate something: The water is sinking into the ground.
3. To invest some resources in something, especially without any prospect of return: If the city continues to sink money into that new convention center, it will go broke.
See also: sink
References in periodicals archive ?
Ship captured and sunk by Germans in the Arabian Sea.
Vessel sunk in collision in the Bristol Channel and ultimately blown up by Trinity House.
Ship torpedoed by German submarine and sunk off Beachy Head.
August 1915 | Ruel, a steam screw with a gross tonnage of 4,029, vessel sunk by shell fire from German submarine off the Scilly Isles on August 21, 1915.
The anti-fouling paint containing TBT on the hull of the HMCS Chaudiere, sunk north of Vancouver in December of 1992, was of no concern to Environment Canada during an environmental monitoring study conducted two years after it was sunk.
The ARSBC has sunk four ships to date, the most recent being the HMCS Columbia sunk June 22, near Campbell River.
"Sinkings are subsidized by the taxpayer, but there has been little opportunity for public input and to date, there has been no formal public hearing process on any ship sunk by ARSBC in BC coastal waters," says Heffernan.
There is no suggestion the Harvester was sunk deliberately.
In 1990, for example, the number of newly sunk shafts was 10% lower than were sunk in 1989.
To eliminate these problems, 'soviet' shafts of more than 7 m diameter have usually been sunk using a 2KS2u/40 unit, which is equipped with two rotating beams each with its own 0.65 |m.sup.3~ grab and operator's cab.
As mentioned above, the majority of 'soviet' shafts are sunk using monolithic concrete as the permanent lining, which is put in place immediately after the deepening of the shaft face.
But he denies Shields's claim that Foster said that the boat had to be sunk after a phone call with Richard Gidney.
They had no right telling me they had sunk the boat, because if I didn't know then it would not have been on my mind all this time."
There is no question that the Solway Harvester was sunk deliberately.
Shields, 17, claimed he used a blowtorch to burn two holes the size of a 50p piece in the hull after being told by Foster that it had to be sunk.