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Phrase(s): Better the devil you know than the devil you don’t know.
Prov. If you have to choose between a familiar but unpleasant situation and an unfamiliar situation, choose the familiar one because the unfamiliar situation may turn out to be worse. • Jill: I hate my job so much that I’m thinking of asking for a transfer. Jane: I’d advise against it. Better the devil you know than the devil you don’t know. • Although she was unhappy in her marriage, Donna never considered pursuing romances with other men. "Better the devil you know than the devil you don’t know," was her philosophy.
McGrawhill's American Idioms And Phrasal Verbs