definition of
cool off

[1] #1 cool off v. become quiet or calm, especially after a state of agitation; "After the fight both men need to cool off."; "It took a while after the baby was born for things to settle down again.". wn

[2] #2 cool off v. lose intensity; "His enthusiasm cooled considerably". wn

[3] #3 cool off v. feel less enamoured of something or somebody. wn