eat vs polish off

eat and polish off both are verbs.

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

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

eat (verb)	polish off (verb)
cause to deteriorate due to the action of water, air, or an acid	finish a task completely
take in solid food	finish eating all the food on one's plate or on the table
eat a meal; take a meal	kill intentionally and with premeditation
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way