underdrive

[ uhn-der-drahyv ]
/ ˈʌn dərˌdraɪv /

noun

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

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Origin of underdrive

First recorded in 1925–30; under- + drive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020