chill out vs cool it

chill out and cool it both are verbs.

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

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

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

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

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