·vt To fasten with a cotter.
II. Cotter ·noun A Toggle.
III. Cotter ·noun ·Alt. of Cottar.
IV. Cotter ·noun 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.