cool down
phrasal verb.phrasal verb. to become less hot, or to become calm after being angry or excited.
phrasal verb. to decrease in temperature; figuratively, to return to a state of emotional composure following a period of agitation or intense activity.
Let your soup cool down before you eat it.
After their big argument, he went for a long walk to cool down.
The engine requires several hours to cool down completely before any mechanical repairs can be safely attempted by the technicians.
can be used for physical temperature or for human emotions and social situations.
contrast with 'cool off', which is often used for physical relief from heat (like jumping in a pool), whereas 'cool down' is more common for the process of losing heat or calming anger.
I waited for the coffee cool down.I waited for the coffee to cool down.when 'cool down' follows 'wait for [object]', the infinitive 'to' is required.