From Longman Dictionary of Contemporary Englisheat humble pieeat humble pie (also eat crow American English)ADMIT to admit that you were wrong and say that you are sorry → eat
Examples from the Corpus
eat humble pie• Martinez had to eat crow when he bragged that the Red Sox would win the division and they came in last.• Taylor's victory in the semi-final has forced many of her critics to eat humble pie.• The Midlanders have been eating humble pie this season, though they deserve better fare.• Come and take potluck eat humble pie whatever.eat humble pieeat humble pieSORRY/APOLOGIZEto admit that you were wrong about something → humbleExamples from the Corpus
eat humble pie• The Midlanders have been eating humble pie this season, though they deserve better fare.• Come and take potluck eat humble pie whatever. 