eat up vs tuck away

eat up and tuck away both are verbs.

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

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

Other hyponyms of eat up include put away, tuck in, consume, demolish, devour, down, go through.

eat up (verb)	tuck away (verb)
finish eating all the food on one's plate or on the table	eat up; usually refers to a considerable quantity of food
use up (resources or materials)
enclose or envelop completely, as if by swallowing