[eat crow] {v. phr.}
To admit you are mistaken or defeated; take back a mistaken statement.
* /John had boasted that he would play on the first team; but when the coach did not choose him, he had to eat crow./* /Fred said he could beat the new man in boxing, but he lost and had to eat crow./
Compare: BACK DOWN, EAT HUMBLE PIE, EAT ONE'S WORDS.