eat up phrasal verb ( see also ↑ eat )
1 . to eat all of something:
Come on, eat up, there’s a good girl.
eat something ↔ up
She’s made a cake and wants us to help eat it up.
2 . eat something ↔ up informal to use a lot of something, especially until there is none left:
Big cars just eat up money.
3 . be eaten up with/by jealousy/anger/curiosity etc to be very jealous, angry etc, so that you cannot think about anything else