cool it vs chill out

cool it and chill out both are verbs.

Word	Noun	Adjective	Verb	Adverb
cool it	No	No	Yes	No
chill out	No	No	Yes	No

As verbs, cool it and chill out are synonyms defined as:

cool it and chill out: become quiet or calm, especially after a state of agitation

Other synonyms of cool it include calm, calm down, cool off, settle down, simmer down.

cool it (verb)	chill out (verb)
become quiet or calm, especially after a state of agitation	become quiet or calm, especially after a state of agitation