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rockshaft

American  
[rok-shaft, -shahft] / ˈrɒkˌʃæft, -ˌʃɑft /

noun

Machinery.

  1. an oscillating shaft.

rockshaft British  
/ ˈrɒkˌʃɑːft /

noun

  1. a shaft that rotates backwards and forwards rather than continuously, esp one used in the valve gear of a steam engine

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of rockshaft

First recorded in 1870–75; rock 2 + shaft

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.