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Phrase(s): (I) wouldn’t if I were you.
Fig. a polite way to advise someone not to do something. • Mary: Do you think I should trade this car in on a new one? Sally: I wouldn’t if I were you. • Bob: I’m going to plant nothing but corn this year. Sue: I wouldn’t if I were you. Bob: Why? Sue: It’s better to diversify.
McGrawhill's American Idioms And Phrasal Verbs