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Phrase(s): Don’t look a gift horse in the mouth.
Prov. Do not look for defects in a gift. • Jill: I wonder why Grandma gave me this table. Maybe it has one leg shorter than the others. Jane: Don’t look a gift horse in the mouth. • Mike: This letter says I just won a trip to Hawaii. I bet there’s some kind of catch. Keith: Don’t look a gift horse in the mouth.
McGrawhill's American Idioms And Phrasal Verbs