1. Literally, to eat something, especially to eat all of it. Often used as an imperative. I know lasagna isn't your favorite, kiddo, but if you want dessert, you've got to eat it up. Go on, eat it up. It will make you feel better.

2. To believe unquestioningly that something is true. I told them that I like this stupid school, and they totally ate it up—I guess I'm a pretty good actress.

3. To thoroughly enjoy something. When anyone showers the baby with love and affection, she just eats it up! Great job on the presentation—the board is going to eat it up.

1. verb To eat, especially to completely finish one's food. A noun or pronoun can be used between "eat" and "up." Often used as an imperative. Kim may be tiny, but she has a big appetite and will eat up anything you put in front of her. We've got to leave soon, kids, so eat up. Eat your vegetables up if you want to grow up strong.

2. verb To bite one excessively, as of insects. A noun or pronoun can be used between "eat" and "up." If you're outside at dusk, the mosquitos will eat you up.

3. verb To take or require a lot of some resource. A noun or pronoun can be used between "eat" and "up." I'm in a poor financial state because my hospital bills have eaten up so much of my money.

4. verb To believe unquestioningly that something is true. A noun or pronoun can be used between "eat" and "up." I told them that I like this stupid school, and they totally ate it up—I guess I'm a pretty good actress.

5. verb To thoroughly enjoy something. A noun or pronoun can be used between "eat" and "up." The baby just eats up everyone's love and affection.

6. verb To continually bother or worry someone. A noun or pronoun can be used between "eat" and "up." The precarious state of my finances has really begun to eat me up. I'm worried that your critical comments have begun to eat Tiffany up—she seems very subdued these days.

7. verb To overwhelm and/or easily defeat one due to being more aggressive, powerful, etc. A noun or pronoun can be used between "eat" and "up." Our team isn't very good, and I'm worried that the competition at this level will eat us up.