Available Definitions:
1) n. - The fleshy or muscular part of the side of an animal, between the ribs and the hip. See Illust . of Beef.
2) n. - The side of an army, or of any division of an army, as of a brigade, regiment, or battalion; the extreme right or left; as, to attack an enemy in flank is to attack him on the side.
3) n. - That part of a bastion which reaches from the curtain to the face, and defends the curtain, the flank and face of the opposite bastion; any part of a work defending another by a fire along the outside of its parapet.
4) n. - The side of any building.
5) n. - That part of the acting surface of a gear wheel tooth that lies within the pitch line.
6) v. t. - To stand at the flank or side of; to border upon.
7) v. t. - To overlook or command the flank of; to secure or guard the flank of; to pass around or turn the flank of; to attack, or threaten to attack; the flank of.
8) v. i. - To border; to touch.
9) v. i. - To be posted on the side.