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cotter pin

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cotter pin

–noun Machinery.
a cotter having a split end that is spread after being pushed through a hole to prevent it from working loose.

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cotter pin  


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n.  A split cotter inserted through holes in two or more pieces and bent at the ends to fasten the pieces together.
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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