swallow up vs eat up

swallow up and eat up both are verbs.

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

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

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

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

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