what does "10-4" mean in the movie "all the kings men" as said by
broderick crawford?

Hi, zeker-ga:

The phrase "10-4" is an old two-way radio code for "okay, message received".

This basic form of acknowledgement has wide currency in Citizens Band (CB) 
radio.  See here:

http://www.roity.com/rc/cbradio/cbcodes.html

Let me know if further clarification is desired.

regards, mathtalk


Search Strategy

Keywords: "10 4" "CB radio"

While the answer is absolutely correct regarding the "10-4" part, I
think that you might be thinking about Broderick Crawford in the TV
series "Highway Patrol" where he would stand outside his car and bury
the radio mike in his hand while growling "10-4" to all the radio
transmissions.