eat up vs swallow up

eat up and swallow up both are verbs.

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

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

eat up and swallow up: enclose or envelop completely, as if by swallowing

Other synonyms of eat up include bury, immerse, swallow.

eat up (verb)	swallow up (verb)
finish eating all the food on one's plate or on the table	enclose or envelop completely, as if by swallowing
use up (resources or materials)
enclose or envelop completely, as if by swallowing