eat one’s words

(verb) to admit that something you said in the past was wrong

Example Sentences:

A: Canada is the biggest country in the world.
B: No it’s not, it’s Russia.
A: Russia? You idiot, it’s Canada!
B: Let’s check on the internet! They check.
A: Well, you’re right. Looks like I have to eat my words

After telling the student that he was going to fail the class, the professor ate his words when the student got 100% on the final exam.

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Similar idioms:

1. put one’s foot in one’s mouth
2. not mince words
3. a picture paints a thousand words
4. tell on someone
5. epic fail
6. eat crow
7. eat humble pie
8. do or die
9. under the weather
10. go over
11. sit pretty
12. tip my hat to someone
13. bark up the wrong tree