Quizzes & Puzzles17 mins ago
ten-four
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what does ten-four mean?
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For more on marking an answer as the "Best Answer", please visit our FAQ.While this saying did lapse into popular use in the CB world it originally comes from American police shorthand for speed in their radio messages. It does indeed mean "message received and understood". 10-10 stands for over and out and there are lots of others to describe various offences and scenarios that officers would come accross.