eat vs eat up

eat and eat up both are verbs.

Word	Noun	Adjective	Verb	Adverb
eat	No	No	Yes	No
eat up	No	No	Yes	No

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

As verbs, eat and eat up are synonyms defined as:

Other synonyms of eat include consume, deplete, exhaust, expend, run through, use, use up, wipe out.

eat (verb)	eat up (verb)
cause to deteriorate due to the action of water, air, or an acid	finish eating all the food on one's plate or on the table
take in solid food	use up (resources or materials)
eat a meal; take a meal	enclose or envelop completely, as if by swallowing
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way