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Phrase(s): A guilty conscience needs no accuser.
Prov. If you have done something wrong and feel guilty about it, you will be uncomfortable and want to confess even if no one accuses you of wrongdoing. • Even though no one noticed him eating most of the cookies, Peter felt so bad about it that he told us what he had done. A guilty conscience needs no accuser.
McGrawhill's American Idioms And Phrasal Verbs