cotter pin

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. 2012.
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Cotter pin is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
cotter pin
 
n
1.  a split pin secured, after passing through holes in the parts to be attached, by spreading the ends
2.  a tapered pin threaded at the smaller end and secured by a nut after insertion

Collins English Dictionary - Complete & Unabridged 10th Edition
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