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| e·mer·gen·cy brake (plural e·mer·gen·cy brakes) |
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1. secondary brake on vehicle: a brake on a vehicle intended to be used when the main brakes have failed or when a sudden halt is required, or to prevent a parked vehicle from moving
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2. device to stop machinery: a mechanical device on a piece of machinery, used to bring the machinery to a halt when a dangerous condition arises
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