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Top Definition. dog whistle. Dog whistle is a type of strategy of communication that sends a message that the general population will take a certain meaning from, but a certain group that is in the know will take away the secret, intended message. Often involves code words.
Train whistle. A train whistle or air whistle (originally referred to as a steam trumpet) is an audible signaling device on a steam locomotive used to warn that the train is approaching, and to communicate with rail workers. Modern locomotives primarily use a powerful air horn instead of a whistle as an audible warning device.