A cock. 1. The male of birds, particulary of gallinaceous or domestic fowls. 2. The act of cocking; also, the turn so given; as, a cock of the eyes; to give a hat a saucy cock. 3. The notch of an arrow or crossbow. 4. A small concial pile of hay. 5. A small boat. 6. A corruption or disguise of the word God, used in oaths.