cotter pin

noun

A split pin, the ends of which project through an object being fastened and are bent back to hold it in place.

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Meanings

nouncotter pin (plural cotter pins)

plural cotter pins

  1. USA split pin, the ends of which project through an object being fastened and are bent back to hold it in place.
  2. UKA pin or wedge inserted through a slot to hold machine parts together; a cotter.

Synonyms & antonyms

Also see
split pin
Cite this entry
APA

cotter pin. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/cotter%20pin

MLA

“cotter pin.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cotter%20pin. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “cotter pin,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/cotter%20pin.

Source: cotter pin on Wiktionary, CC BY-SA 4.0.