Hotbox meaning

hŏt'bŏks'
An axle or journal box, as on a railway car, that has become overheated by excessive friction.
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An overheated bearing on an axle or shaft.
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A container maintained at elevated temperatures in order to heat or cook its contents.
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(engineering) An overheated shaft bearing.
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To smoke marijuana in a small confined area, such as the inside of a car, until it is full of smoke, thereby purportedly intensifying the drug's effects.
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To put out a cigarette just before entering a vehicle, then expel smoke in the vehicle.
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Origin of hotbox