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Phrase(s): get something straight from the horse’s mouth
Prov. to get information from the person most directly involved or best informed. • Jill: Sue is going to have a baby. Jane: Who told you that? Jill: I got it straight from the horse’s mouth. • There’s a rumor that Randolph is moving to Alaska, but I won’t believe it until I get it straight from the horse’s mouth.
McGrawhill's American Idioms And Phrasal Verbs