polish off vs put away

polish off and put away both are verbs.

Word	Noun	Adjective	Verb	Adverb
polish off	No	No	Yes	No
put away	No	No	Yes	No

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

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

polish off (verb)	put away (verb)
finish a task completely	turn away from and put aside, perhaps temporarily
finish eating all the food on one's plate or on the table	eat up; usually refers to a considerable quantity of food
kill intentionally and with premeditation	kill gently, as with an injection
	place in a place where something cannot be removed or someone cannot escape
	stop using
	throw or cast away
	lock up or confine, in or as in a jail