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Phrase(s): if I’ve told you once, I’ve told you a thousand times
Fig. an expression that introduces a scolding, usually to a child. • Mother: If I’ve told you once, I’ve told you a thousand times, don’t leave your clothes in a pile on the floor! Bill: Sorry. • "If I’ve told you once, I’ve told you a thousand times, keep out of my study!" yelled Bob.
McGrawhill's American Idioms And Phrasal Verbs