(military, weaponry) direction in which a weapon fires / (figuratively, by extension) position vulnerable to attack

(geology) A line in the plane of a stratum, or part of a stratum, perpendicular to its intersection with a horizontal plane; the line of greatest inclination of a stratum to the horizon

(military) The position of troops drawn up in their usual order without any determined maneuver. / (naval) The line or arrangement formed by vessels of war in an engagement.

(nautical) A wooden tub in which the tow-line carried by a whaleboat is coiled.

(geometry) A line joining centers of figures. / (engineering) A line joining two centers, or fulcra, as of wheels or levers. / A line which determines a dead center.

A spiral marine shell (Fasciolaria distans), of Florida and the West Indies, marked by narrow, dark, revolving lines.

(baseball, softball) A batted ball hit hard enough and low enough that it appears to travel in a relatively straight line.

(cricket) The direction (line) and point at which a delivery hits the pitch (length) of a delivery considered as a whole, especially that of a group of a particular bowler's deliveries.

(nautical) Properly the International Load Line, a mark on the hull of a merchant ship to show the waterline under specified conditions. The line shows the maximum capacity load the ship may carry.

(idiomatic) A clear distinction in the context of a legal or moral judgment.