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1 definition by Bill V

 
1.
Phrase. drop (verb) tones (noun)

The act of transmitting an electronic tone or set of tones by radio signal to alert a person or group of people. Terminology typically used by public safety dispatchers and emergency personnel.
Engine 11 to Fire Dispatch, drop tones for an additional EMT to respond to the scene of the accident.
ayon kay Bill V ika-29 ng Hulyo, 2005