polish off vs demolish

polish off and demolish both are verbs.

Word	Noun	Adjective	Verb	Adverb
polish off	No	No	Yes	No
demolish	No	No	Yes	No

As verbs, demolish is a hyponym of polish off; that is, demolish is a word with a more specific, narrower meaning than polish off:

Other hyponyms of polish off include put away, tuck away, tuck in, consume, devour, down, go through.

polish off (verb)	demolish (verb)
finish a task completely	defeat soundly and humiliatingly
finish eating all the food on one's plate or on the table	eat up completely, as with great appetite
kill intentionally and with premeditation	destroy completely
	ruin or destroy