(mechanical engineering) A pin or wedge inserted through a slot to hold machine parts together. / (informal) A cotter pin.

(transitive) To fasten with a cotter.

(historical) A peasant who performed labour in exchange for the right to live in a cottage.

plural of cotter

present participle of cotter

simple past tense and past participle of cotter

A surname.

plural of Cotter

(US) A split pin, the ends of which project through an object being fastened and are bent back to hold it in place. / (UK) A pin or wedge inserted through a slot to hold machine parts together; a cotter.

plural of cotter pin