tune in vs tune up

tune in and tune up both are verbs.

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

As verbs, tune up is a hypernym of tune in; that is, tune up is a word with a broader meaning than tune in:

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

Other hypernyms of tune in include tune.

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