What part of "no" do you not understand?

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What part of "no" do you not understand?

cliché I have already said "no," and that is my final answer, so stop trying to elicit a different response from me. A: "Come on, Mom, just let me borrow the car tonight!" B: "Billy, what part of 'no' do you not understand?" I've rejected their application three times already. What part of "no" do they not understand?
See also: not, of, part, what
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