Definition of cotter pin in English:
1A metal pin used to fasten two parts of a mechanism together.
- She slid the cotter pin back through the nut and bolt and screwed the grease cap back on.
- A cotter pin acts a safety measure to prevent the arm from sliding off the stub.
- The cotter pin missed the male spline on the flap motor.
Mid 17th century: of unknown origin.
Definition of cotter pin in:
- US English dictionary
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