Longman Dictionary of Contemporary English homepage

cool

2 verb
     
cool2 S3
1 [intransitive and transitive] also cool down to make something slightly colder, or to become slightly colder:
The air conditioning doesn't seem to be cooling the room much.
Allow the biscuits to cool for five minutes.
a cooling breeze
2 [intransitive] if a feeling, emotion, or relationship cools, it becomes less strong:
The affair had cooled, on her side at least.
When tempers had cooled, he apologized.
3

cool it

spoken
a) used to tell someone to stop being angry, violent etc:
Come on now - calm down, cool it.
b) to stop putting as much effort into something, or pressure on someone, as you have been:
He was getting more serious about her. It was time to cool it.
4

cool your heels

to be forced to wait:
I'll put him in a cell to cool his heels for a bit.

cool down

phrasal verb
1 to make something slightly colder, or to become slightly colder:
The air has cooled down a little now.
cool somebody/something ↔ down
A cold beer will cool you down.
2 to become calm after being angry:
After I cooled down I realized I had been wrong.

cool off

phrasal verb
1 to return to a normal temperature after being hot:
Cool off with an iced drink.
By late autumn Mediterranean islands have cooled off, and can have rainy days.
2 to become calm after being angry:
He slammed the door and went for a walk to cool off.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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