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| contends extension of a spring is proportional with the load applied to it |
| air brake | |
| —n | |
| 1. | a brake operated by compressed air, esp in heavy vehicles and trains |
| 2. | Also called: dive brake an articulated flap or small parachute for reducing the speed of an aircraft |
| 3. | a rotary fan or propeller connected to a shaft to reduce its speed |