tune up vs tune in

tune up and tune in both are verbs.

Word	Noun	Adjective	Verb	Adverb
tune up	No	No	Yes	No
tune in	No	No	Yes	No

As verbs, tune in is a hyponym of tune up; that is, tune in is a word with a more specific, narrower meaning than tune up:

tune up: adjust for (better) functioning
tune in: regulate (a radio or television set) in order to receive a certain station or program

Other hyponyms of tune up include fine-tune, tweak, service.

tune up (verb)	tune in (verb)
adjust the pitches of (musical instruments)	regulate (a radio or television set) in order to receive a certain station or program
adjust for (better) functioning