[v. oh-ver-drahyv; n. oh-ver-drahyv]
verb (used with object), overdrove, overdriven, overdriving.
to push or carry to excess; overwork.
to drive too hard.
Machinery, Automotive. a device containing a gear set at such ratio and arrangement as to provide a drive shaft speed greater than the engine crankshaft speed.
Informal. an intense state of activity or productivity: The political campaign has shifted into overdrive.

before 950; Middle English overdriven to cover over, overpower; Old English oferdrīfan to drive away, overthrow. See over-, drive

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a very high gear in a motor vehicle used at high speeds to reduce wear and save fuel
2.  in overdrive in a state of intense activity
3.  into overdrive into a state of intense activity
vb , -drives, -driving, -drove, -driven
4.  (tr) to drive too hard or too far; overwork or overuse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"speed-increasing gear in an automobile," 1929, from over + drive.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Overdrive definition

An Intel Pentium processor which fits into a socket designed to accomodate an Intel 486, or into a special upgrade socket on the motherboard.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Their sniffers ran on overdrive for several hours following the injection.
Too much sends it into overdrive and can have a negative impact on function.
And with the uptick in demand, chocolatiers are throwing experimentation into
Overdrive manages digital rights for e-books in nearly every format.
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