Overdrive
Overdrive , verb, transitive and intransitive
To drive too hard, or far, or beyond strength.
overdrive , noun
1.
(Machinery) A gearing device which causes the drive shaft of an automobile or other machine to rotate at a speed greater than that of the engine crankshaft.
2.
(Automotive) The gear setting of a motor vehicle at which the overdrive{1} is operative; as, cruising at 80 mph in overdrive.
3.
A state of unusually intense activity; as, when they got their new supercomputer, their research kicked into overdrive; one look at her made his heart jump into overdrive; -- used mostly of the activities of persons or groups. [figurative]