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To calm down or stop. This phrase can be used as an imperative exclamation or as a verb phrase in the middle of a sentence. Cool it! I want you two to stop fighting this instant! My muscles have been really sore, so I'm going to cool it with the weight lifting for a while.
Inf. Calm down!; Take it easy! Don't get mad, Bob. Cool it! Cool it, you guys! No fighting around here.
1. Calm down, relax, as in John was beginning to seethe, but I told him to cool it. [Slang; c. 1950]
2. Stop what one is doing, especially stop talking or behaving conspicuously, as in We'd be wise to cool it until the scandal blows over. It is also used as an imperative, as in Cool it! We'll be in trouble if anyone hears you. [Slang; c. 1950]
ˈcool it(informal) behave in a less aggressive or excited way; calm down: His friends were holding him back and telling him to cool it, but he broke free and punched the barman on the nose.
exclam. Calm down! Come on, cool it, man!
1. To calm down; relax.
2. To stop doing something.