Admit a mistake (3,6-3)

I think it could be either:

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3,6-3

eat humble-pie

(Other definitions for eat humble-pie that I've seen before include "Abase oneself" , "Make an abject apology" , "Accept humiliation" , "Be humiliated" , "Make a humiliating apology" .)

I've seen this clue in the Universal.

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