cotter : Idioms & Phrases
cotter pin
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noun a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
WordNet
Gib and key , ∨ Gib and cotter
(Steam Engine) , the fixed wedge or gib, and the driving wedge,key, or cotter, used for tightening the strap which holds the brasses at the end of a connecting rod.