eat (something) up

idiom

Definition of eat (something) up 

1 : to eat all of (something) Eat your dinner up before it gets cold.

2 : to use up (time, resources, etc.) This project has been eating up a large part of the budget. Your savings may be eaten up by inflation.

3 informal : to enjoy (something) greatly I thought the speech was stupid, but the audience ate it up.

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playful or foolish behavior

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