10-4

Donald Steiny

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A CB or ham radio expression meaning “OK.”   Ham radio has almost vanished because of new technology so the most common use that people are familiar with is from truck drivers, who use a CB radio to talk to other truckers about road conditions.   When it is used in conversation it is to give a tone of extreme informality.  For instance, “that’s a big 10-4, buddy” meaning “I agree.”

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