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|Noun||1.||automobile horn - a device on an automobile for making a warning noise|
alarm system, warning device, alarm - a device that signals the occurrence of some undesirable event
auto, automobile, car, motorcar, machine - a motor vehicle with four wheels; usually propelled by an internal combustion engine; "he needs a car to get to work"
horn button - a button that you press to activate the horn of an automobile
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