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.
1.1A split pin that is opened out after being passed through a hole.
Mid 17th century: of unknown origin.
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