go off the deep end

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go off the deep end

1. Literally, to jump into the deep end of a pool (as opposed to the shallow end). Don't let Sally go off the deep end—she doesn’t know how to swim.
2. slang To become crazy or irrational. A; "Now your father thinks the neighbors are plotting against him." B: "Wow, he's really gone off the deep end!" Whoa, man, stop yelling! I only put a tiny scratch on your car, so there's no need to go off the deep end.
See also: deep, end, off

go off the deep end

 and jump off the deep end 
1. Lit. to jump into a swimming pool where the water is over one's head and one needs to be able to swim You are still only learning to swim. Are you ready to go off the deep end? He jumped off the deep end where he would make a bigger splash.
2. Fig. to become deeply involved (with someone or something) before one is ready. (Applies especially to falling in love.) Look at the way Bill is looking at Sally. I think he's about to go off the deep end.
3. Fig. to act irrationally, following one's emotions or fantasies. Now, John, I know you really want to go to Australia, but don't go jumping off the deep end. It isn't all perfect there.
See also: deep, end, off

go off the deep end

1. Become unduly excited, overwrought, or angry. For example, When he heard about John's smashing into his car, he went off the deep end. [c. 1920] Also see in deep, def. 2.
2. Be irrationally carried away, act irresponsibly or heedlessly. For example, Just because you like her looks doesn't mean you should go off the deep end and propose. [c. 1920] In both of these colloquial usages deep end alludes to the deep end of a swimming pool.
See also: deep, end, off

go off the deep end

mainly AMERICAN
1. If someone goes off the deep end, they start to behave in a crazy or very extreme way. Ray gives a chilling performance as the seemingly nice cop who goes off the deep end and starts terrorising a couple. At first they thought that I'd gone off the deep end and had lost my mind.
2. If someone goes off the deep end, they become very angry. My dad went off the deep end when he found out what I'd done. Note: The deep end is the end of a swimming pool where the water is deepest.
See also: deep, end, off

go off (or go in off) the deep end

give way immediately to anger or emotion. informal
This expression refers to the deep end of a swimming pool, where the diving board is located. In the USA the phrase has also developed the meaning ‘go mad’, but in either sense the underlying idea is of a sudden explosive loss of self-control.
See also: deep, end, off

go off the ˈdeep end

(informal) suddenly become very angry or emotional: Don’t tell your father that you lost the money — he’ll just go off the deep end.
See also: deep, end, off

go off the deep end

in. to do or experience something in the extreme: to fall madly in love, to go crazy, to commit suicide, to fly into a rage, etc. I saw what he had done, and I just went off the deep end. I was in a blind rage and didn’t know what I was doing.
See also: deep, end, off
References in classic literature ?
Some shady trees leaned over it, and rushes and water-lilies grew at the deep end.
I've been in the deep end quite a few times," he said.
Now I'm making that transition, I would never jump into the deep end," Page, the son of three-time world champion kickboxer Curtis Page, told Press Association Sport.
Deep End Games has released a new trailer for its upcoming survival horror game, "Perception.
FIVE baby otters have been thrown in at the deep end at Chester Zoo for their debut swimming lessons.
The keeper was thrown in at the deep end for his debut in Wednesday's 3-2 League Cup defeat by old club Hearts.
With its complex characters and emotionally charged mood, Into the Deep End communicates the hardship of existence within the human spirit.
McNair, 19, has been thrown in at the deep end due to a defensive injury crisis at Old Trafford.
The exhibition, titled The Deep End, was a collaborative effort of a group of art and design students from Northumberland College and the fruits of their labour is now set to be screened at the Woodhorn Museum, Ashington.
But I kept returning to the deep end, mostly for the bruise-free swims.
Cambridge, MASS--State officials are about to put a serious obstacle in the path of skateboarders lured each off-season to the empty 12-foot deep end at the Francis J McCrehan Memorial Swimming Pool in Cambridge.
But that means going in the deep end and Becky is scared--a fear that many young readers will relate to.
He was thrown in at the deep end and this is a serious deep end.