10-4

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.

10-4

verb
See ten-four

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
See also:
  • as one does
  • eggs is eggs
  • All-y all-y oxen free!
  • damn well
  • by half
  • a cold day in Hell
  • (one's) best foot forward
  • best foot forward
  • Caturday
  • come on in
References in periodicals archive
Football 11: Glasgow Green Football Centre, Today 11-4, Mon 10-4, Tue 10-4, Wed 10-3, Thur 10-4, Fri 10-1.
Football 5: Glasgow Green, Today 11-4, Mon 10-4, Tue 10-4, Wed 10-3, Thur 10-4, Fri 10-1.
Golf: Langlands, Today 11-3, Mon 10-4, Tue 10-4, Thur 10-4, Fri 10-1.
Judo: Tollcross, Today 10-4, Mon 104, Wed 10-4, Thur 10-4, Fri 10-1.
Kayaking: Strathclyde Park, Today 10-4, Tue 10-4MATP (Motor Activity Training Programme): Gorbals Leisure Centre, Tue 10-4, Wed 10-4, Thur 10-4.
Powerlifting: Kelvin Hall, Today 10-4, Mon 10-4, Tue 10-4.
Special Olympics Glasgow 2005: Your day-by-day guide