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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.
In engineering a dog is a tool that prevents movement or imparts movement by offering physical obstruction or engagement of some kind.nless the dog is engaged, the gear will simply freewheel on the shaft. This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the dog name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth.