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Phrase(s): Honesty is the best policy.
Prov. You should always tell the truth, even when it seems as if it would be useful to tell a lie. • Jill: I borrowed Jane’s white blouse without asking her, and then I spilled tomato sauce on it. Should I tell her what happened, or should I just put the blouse back in her closet and hope she won’t notice? Jane: Honesty is the best policy.
McGrawhill's American Idioms And Phrasal Verbs