Definitions for eat up
eat up, finish, polish off(verb)
finish eating all the food on one's plate or on the table
"She polished off the remaining potatoes"
consume, eat up, use up, eat, deplete, exhaust, run through, wipe out(verb)
use up (resources or materials)
"this car consumes a lot of gas"; "We exhausted our savings"; "They run through 20 bottles of wine a week"
immerse, swallow, swallow up, bury, eat up(verb)
enclose or envelop completely, as if by swallowing
"The huge waves swallowed the small boat and it sank shortly thereafter"
Kernerman English Learner's Dictionary
to eat all of some food
The dog had eaten up all the meat.
to use a lot of sth
a program that eats up a lot of disk space
To consume completely.
To accept or believe entirely, immediately, and without questioning.