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Phrase(s): Let the buyer beware.
Prov. ClichéWhen you buy something, you must take precautions against being cheated, because you cannot trust merchants to be honest about what they sell. • Let the buyer beware when shopping for a used car. • Several of the lamps among those Max offered for sale were broken. "If a customer isn’t smart enough to try a lamp before he buys it, that’s his problem," Max argued. "Let the buyer beware."
McGrawhill's American Idioms And Phrasal Verbs