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1. interjection, slang Used to express that something is acceptable or satisfactory. A: "I'll give you a call in the morning." B: "Cool." A: "Do you want to have pizza for dinner tonight?" B: "Yeah, cool."
2. adjective, slang Sophisticated, fashionable, or knowledgeable of the latest trends. I never hung out with any of the so-called "cool kids" in school. I had way more in common with the kids in band and computer club. Ugh, I hate it when my parents try to act all cool. Like, you're not teenagers—stop pretending to be! We dated for a while, but I always felt like she was way too cool for me.
3. adjective, informal Calm, composed, or unflustered. You've got to stay cool when the boss comes in. Don't let him see that anything is wrong! She was so cool when she made the request that I didn't think anything of it at the time.
4. adjective, slang Very exciting or interesting. Hollywood has always made guns seem cool. A: "I just booked a flight to Paris!" B: "Wow, that's so cool! When are you going?" It was pretty cool getting to see New York City from the inside of a helicopter.
5. adjective, slang Not a problem. A: "I'm sorry for what I said earlier." B: "It's cool, man. Don't worry about it."
6. adjective, slang Unqualified or unexaggerated. I made a cool two million playing the stock markets last year.
7. noun, informal A calm composure or temper. I tried to keep my cool when the famous actor came into my store. He really lost his cool when the waiter dropped his food.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.


1. mod. unabashed; unruffled; relaxed. (see also keep one’s cool, lose one’s cool.) She is totally cool and easygoing.
2. mod. good; excellent. This is a really cool setup!
3. mod. [of music] mellow; smooth. This stuff is so cool, I’m just floating.
4. mod. no less than [some amount of money]. She cleared a cool forty thousand on the Wilson deal.
5. in. to die; to become cold after death. (Medical euphemism.) We were afraid that he would cool.


n. jail. (Usually with the.) Do you want to talk, or do you want to spend a little time in the cooler?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.


Stylish, fashionable, clever. This slangy term expressing admiration dates from the early 1900s as an adjective and was popularized by black jazz musicians from the late 1940s. As an interjection it was then taken up by teenagers and then by the general population. Describing the plan for an assassination, a character in James Patterson’s London Bridges (2004) exclaimed, “Not only is this smart, it is cool as hell.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
References in periodicals archive ?
Shakeout--The cooled mold is transferred to the shakeout platform, where the broken mold and castings are pushed off onto the shakeout screen.
The researchers found that 21 of 43 cooled patients (49 percent) were ultimately discharged to their homes or a rehabilitation center, compared with only 9 of 34 patients (26 percent) kept warm.
The masterbatch passes from the primary mixer into the tandem mixer below, where it is cooled and finish-mixed while the next masterbatch is being prepared in the upper mixer.
Typically, plastic materials are injected hot into the mold where they are cooled or "frozen" into the cavity.
but Shull believes that, at least in theory, magnetically cooled ice cream "is possible."
On CLIMAP, Guilderson contends that the older study may have missed changes in the tropics because two of the dominant plankton species in the region can withstand big temperature changes and could have continued to inhabit the tropics even if the ocean cooled significantly.
They will unerringly follow an isotherm of thermal balance between the electromagnetic flux/channel on one side and the cooled case or bushing on the other.
He says most cerebral-temperature regulation takes place in the cavernous sinus just below the brain, where arteries with warm blood come in contact with veins containing blood cooled by evaporation from nasal mucus and facial sweat.
In addition, the sand will be cooled by radiation losses and conduction to the steel structure that houses the sand cooling system.
But such theories contain a major flaw: Gravity would quickly cause much of the cooled, denser coronal gas to fall to the solar surface, and the small amount of material left behind in the corona would be insufficient to create the massive prominences observed.
As a molten metal is cooled to its freezing temperature, solidification begins in the region of lowest temperature.
But depending on how those hard-boiled eggs were cooled, their unrefrigerated storage may pose a risk of botulism, according to researchers with the National Food Processors Association (NFPA) in Washington, D.C.
The sand is cooled from its 1400-1600F temperature range down to ambient [+ or -] 20F by cascading the sand through a slow-moving stream of ambient air together with direct heat transfer into a relatively cool drum.
The wedge test uses a specifically dimensioned wedge that is cast in a core mold, cooled and then broken.
Moisture addition can be accomplished by utilizing a programmable controlled system that meters water additions by sensing the rate of sand flow, and using a belt weigh scale and infrared temperature sensing devices before water additions are made and after the sand has been cooled through the cooler.