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underdrive

American  
[uhn-der-drahyv] / ˈʌn dərˌdraɪv /

noun

  1. a speed-reducing gear device in a motor vehicle that causes the output drive shaft to rotate at a slower rate.

Etymology

Origin of underdrive

First recorded in 1925–30; under- ( def. ) + drive ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.