1. (n.) Alt. of Cottar.

2. (n.) A piece of wood or metal, commonly wedge-shaped, used for fastening together parts of a machine or structure. It is driven into an opening through one or all of the parts. [See Illust.] In the United States a cotter is commonly called a key.

3. (n.) A toggle.

4. (v. t.) To fasten with a cotter.

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