What part of "no" don't you understand?

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What part of "no" don't you 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' don't you understand?" I've rejected their application three times already. What part of "no" don't they understand?
See also: of, part, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

what part of no don't you understand?

I mean no, and that’s that. This flat denial dates from the late 1900s. It gained currency with a popular song, “What part of no don’t you understand? To put it plain and simple I’m not into one-night stands” (recorded by country music singer Lorrie Morgan, 1992; lyrics by Wayne Perry and Gerald Smith). Also see won't take no for an answer.
See also: no, of, part, what
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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