English

Definition of cotter pin noun from the Oxford Advanced Learner's Dictionary

 

cotter pin

 noun
noun
BrE BrE//ˈkɒtə pɪn//
 
; NAmE NAmE//ˈkɑːtər pɪn//
 
(specialist)
 
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a metal pin that holds a part in place inside a machine Word Origin mid 17th cent.: of unknown origin.
See the Oxford Advanced American Dictionary entry: cotter pin