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

Derived forms: come clean, coming clean, came clean

Type of: concede, confess, profess