eat humble pie
US /iːt ˈhʌm.bəl paɪ/
UK /iːt ˈhʌm.bəl paɪ/
1.
to admit that you were wrong and apologize, especially in a humiliating way
:
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After boasting about his victory, he had to eat humble pie when he lost the game.
•
The CEO had to eat humble pie and apologize to the employees for his poor decisions.