(1):

(n.) A barbed spear or a hook with a handle, used by fishermen in securing heavy fish.

(2):

(n.) The spar upon which the upper edge of a fore-and-aft sail is extended.

(3):

(n.) Same as Gaffle, 1.

(4):

(v. t.) To strike with a gaff or barbed spear; to secure by means of a gaff; as, to gaff a salmon.