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Phrase(s): How many times do I have to tell you?
Inf. a phrase admonishing someone who has forgotten instructions. • Mother: How many times do I have to tell you? Do your homework! Bill: Mom! I hate school! • Mary: Clean this place up! How many times do I have to tell you? Bill: I’ll do it! I’ll do it!
McGrawhill's American Idioms And Phrasal Verbs