10-4

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10-4

OK; all right. Used to indicate affirmation or acknowledgment. The phrase comes from CB radio, which was commonly used (especially by truck drivers) before the proliferation of cell phones. A: "I'm going to pull over up ahead." B: "10-4."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

10-4

verb

ten-four

and 10-4
interj. okay. (Citizens band radio.) Ten-four, old buddy. I will do that.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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