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Related to humble pie: eat humble pie
An admission that one is wrong, usually when it triggers great embarrassment or shame. The phrase derives from an actual "humble pie": a pie made from unpalatable animal parts, usually those of a deer. Ugh, now that my idea has failed, I'll have to eat humble pie in the board meeting tomorrow. I think Ellen is a perfectionist because the thought of having to eat humble pie terrifies her.
A meek admission of a mistake. The “humble pie” that we eat when we make a misjudgment or outright error was originally “umble” pie made from the intestines of other less appetizing animal parts. Servants and other lower-class people ate them, as opposed to better cuts. “Umble” became “humble” over the years until eating that pie came to mean expressing a very meek mea culpa. A similar phrase is “eat crow,” the bird being as unpalatable a dish as one's own words.