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Verb: fess up
Usage: informal
  1. Admit or acknowledge a wrongdoing or error
    "the writer of the anonymous letter fessed up after they identified his handwriting";
    - make a clean breast of, own up, cop [N. Amer, informal], own, cop to [N. Amer, informal], come clean [informal], fess [informal]

Derived forms: fesses up, fessed up, fessing up

Type of: concede, confess, profess