slay vs polish off

slay and polish off both are verbs.

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

As verbs, slay and polish off are synonyms defined as:

Other synonyms of slay include bump off, dispatch, hit, murder, off, remove.

slay (verb)	polish off (verb)
kill intentionally and with premeditation	finish a task completely
to succeed greatly	finish eating all the food on one's plate or on the table
	kill intentionally and with premeditation