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Definition of: overdrive
(ō′vər·drīv′) v.t. ·drove, ·driv·en, ·driv·ing
1. To push too hard or too far; overwork.
2. To drive too hard.
—noun (ō′vər·drīv′) Mech. A gearing device which turns a drive shaft at a speed greater than that of the engine, thus decreasing power output: opposed to underdrive.
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