10-4

Copy that, over

10-4 is radio communication shorthand meaning "message received" or "understood," originally from police and trucking CB radio codes.

Now used casually to acknowledge any statement or instruction: Can you pick up milk on your way home? 10-4.

The response signals not just that you heard, but that you'll comply.

acknowledgment

understood

Grasped the meaning

confirmedEstablished as accurate
affirmativeExpressing agreement or consent
receivedWas given something

message received · got it · loud and clear · comprehended · noted · acknowledged · proceeding · on it · agreed · accepted

radioCB

roger

Radio acknowledgment term

copy thatAcknowledgment of communication
affirmativeExpressing agreement or consent
understoodGrasped the meaning

over and out · breaker breaker · good buddy · what's your 20 · smokey · convoy · trucker · CB radio · handle · channel

policeEmergency

dispatch

Send with speed

codeSymbolic communication system
patrolRegular surveillance route
officerAuthority figure in uniform

squad car · radio call · APB · responding · en route · backup · unit · precinct · scanner · walkie-talkie

Categories

Ten-Codes
affirmativesyes, yeah, yep, yup, absolutely
police radioAPB, BOLO, copy, copy that, dispatch
police slangperp, collar, bust, APB, BOLO
radio lingoroger, copy, over, out, affirmative
policeofficer, cop, officers, patrol, cops

Opposites

acknowledgment/comprehension

Request for repetition

repeat · come again · negative · unreadable · garbled

agreement/compliance

Opposite of affirmative

no can do · no · no-go · nope · refused

communicative function

10-4what's your 20

Request for location

come in · over and out

Family

ten, four, tens, fours, fourth, fourths, tenth, tenths, fourteen

Familiarity: Top 200,000
Profile: Mostly American · Timeless · Abstract · Rated G