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Phrase(s): Conscience does make cowards of us all.
Prov. People sometimes fear to do what they want or what they believe is necessary because they think it is wrong. (From Shakespeare’s play, Hamlet.) • Alan: I really want to go to the ball game with you guys this afternoon, but it just doesn’t seem right to skip work to do it. Fred: Conscience does make cowards of us all, right, Alan?
McGrawhill's American Idioms And Phrasal Verbs