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underdrive

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un⋅der⋅drive

[uhn-der-drahyv]
–noun
a speed-reducing gear device in a motor vehicle that causes the output drive shaft to rotate at a slower rate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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un·der·drive   (ŭn'dər-drīv')   
n.  A gearing device that causes the output drive shaft to rotate at a slower rate than the engine input shaft.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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