Meaning of “cool” - Learner’s Dictionary

cool

verb [ I, T ] uk us /kuːl/
LESS HOT

B2 to become less hot, or to make something become less hot:

Allow the bread to cool before slicing it.
LESS STRONG

If emotions or relationships cool, or if something cools them, they become less strong.

(Definition of “cool verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)