1. to have to take back what you said; to admit humbly that you were wrong; to confess that one’s predictions were wrong; retract what one has said

1. He predicted that I’d fail biology, but I got a D. Now he'll have to eat his words.

2. You shouldn’t say that to me. I’ll make you eat your words.

3. John was wrong about the election and had to eat his words.

4. You know what? You're gonna eat your words.