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Verb: fess up
  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], own, cop to [N. Amer], come clean, fess

Derived forms: fessing up, fesses up, fessed up

Type of: concede, confess, profess