hit it off vs get on

hit it off and get on both are verbs.

Word	Noun	Adjective	Verb	Adverb
hit it off	No	No	Yes	No
get on	No	No	Yes	No

As verbs, hit it off and get on are synonyms defined as:

Other synonyms of hit it off include get along, get along with, get on with.

hit it off (verb)	get on (verb)
have smooth relations	develop in a positive way
	appear in a show, on T.V. or radio
	grow old or older
	get up on the back of
	grow late or (of time) elapse
	get on board of (trains, buses, ships, aircraft, etc.)
	have smooth relations