chill out vs cool off

chill out and cool off both are verbs.

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

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

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

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

chill out (verb)	cool off (verb)
become quiet or calm, especially after a state of agitation	lose intensity
	become quiet or calm, especially after a state of agitation
	feel less enamoured of something or somebody