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rocker arm

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rocker arm

–noun Machinery.
a rocking or oscillating arm or lever rotating with a moving shaft or pivoted on a stationary shaft.

Origin:
1855–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rocker arm  
n.  A pivoted lever used in an internal combustion engine to transfer cam or pushrod motion to a valve stem.
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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