spec. A fighting man on board ship; a marine. Obsolete.

Originally: a soldier enlisted and trained to serve on board ship (and, in certain circumstances, on shore, esp. in the dockyards). Now chiefly: a…

= marine, n. 2.

A royal marine. tame jolly, a militiaman.

A marine mounted on horseback, or a cavalryman doing a marine's work.

British. Military. A soldier, esp. a low-ranking soldier. Also: a marine.

A marine. U.S.

(A nickname for) a member of the United States Marine Corps. Frequently in plural.

U.S. Military slang. A member of the United States Marine Corps.