Hard lines, hard lot. C. Kingsley. [See Def. 18.] -- Line breeding (Stockbreeding), breeding by a certain family line of descent, especially in the selection of the dam or mother. -- Line conch (Zoöl.), a spiral marine shell (Fasciolaria distans), of Florida and the West Indies. It is marked by narrow, dark, revolving lines. -- Line engraving. (a) Engraving in which the effects are produced by lines of different width and closeness, cut with the burin upon copper or similar material; also, a plate so engraved. (b) A picture produced by printing from such an engraving. -- Line of battle. (a) (Mil. Tactics) The position of troops drawn up in their usual order without any determined maneuver. (b) (Naval) The line or arrangement formed by vessels of war in an engagement. -- Line of battle ship. See Ship of the line, below. -- Line of beauty (Fine Arts), an abstract line supposed to be beautiful in itself and absolutely; -- differently represented by different authors, often as a kind of elongated S (like the one drawn by Hogarth). -- Line of centers. (Mach.) (a) A line joining two centers, or fulcra, as of wheels or levers. (b) A line which determines a dead center. See Dead center, under Dead. -- Line of dip (Geol.), 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. -- Line of fire (Mil.), the direction of fire. -- Line of force (Physics), any line in a space in which forces are acting, so drawn that at every point of the line its tangent is the direction of the resultant of all the forces. It cuts at right angles every equipotential surface which it meets. Specifically (Magnetism), a line in proximity to a magnet so drawn that any point in it is tangential with the direction of a short compass needle held at that point. Faraday. -- Line of life (Palmistry), a line on the inside of the hand, curving about the base of the thumb, supposed to indicate, by its form or position, the length of a person's life. -- Line of lines. See Gunter's line. -- Line of march. (Mil.) (a) Arrangement of troops for marching. (b) Course or direction taken by an army or body of troops in marching. -- Line of operations, that portion of a theater of war which an army passes over in attaining its object. H. W. Halleck. -- Line of sight (Firearms), the line which passes through the front and rear sight, at any elevation, when they are sighted at an object. -- Line tub (Naut.), a tub in which the line carried by a whaleboat is coiled. -- Mason and Dixon's line, the boundary line between Pennsylvania and Maryland, as run before the Revolution (1764-1767) by two English astronomers named Charles Mason and Jeremiah Dixon. In an extended sense, the line between the free and the slave States. -- On the line, on a level with the eye of the spectator; -- said of a picture, as hung in an exhibition of pictures. -- Right line, a straight line; the shortest line that can be drawn between two points. -- Ship of the line, formerly, a ship of war large enough to have a place in the line of battle; a vessel superior to a frigate; usually, a seventy-four, or three- decker; -- called also line of battle ship. Totten. -- To cross the line, to cross the equator, as a vessel at sea. -- To give a person line, to allow him more or less liberty until it is convenient to stop or check him, like a hooked fish that swims away with the line. -- Water line (Shipbuilding), the outline of a horizontal section of a vessel, as when floating in the water.

He had a healthy color in his cheeks, and his face, though lined, bore few traces of anxiety. Dickens.

This custom of reading or lining, or, as it was frequently called, "deaconing" the hymn or psalm in the churches, was brought about partly from necessity. N. D. Gould.

To line bees, to track wild bees to their nest by following their line of flight. -- To line up (Mach.), to put in alignment; to put in correct adjustment for smooth running. See 3d Line, 19.