eat (something) up
Definition: to eat all (of something)
Examples: We've prepared enough food for everyone, so eat up! ○ Let's eat up these apples.
eat something up
Definition: to use a large part of something
Example: The project is eating up our limited budget.
eat somebody up
Definition: to preoccupy somebody
Example: My manager is eaten up by/with envy/jealousy.
Usage note: used of a feeling, usually in the passive