A covering for the inside surface of something. / The material used for such a covering. / The act of attaching such a covering.

present participle of line

plural of lining

(geometry) An infinitely extending one-dimensional figure that has no curvature; one that has length but not breadth or thickness.

(transitive) To place (objects) into a line (usually used with "up"); to form into a line; to align.

(obsolete) Flax; linen, particularly the longer fiber of flax.

(transitive) To cover the inner surface of (something), originally especially with linen. / To reinforce (the back of a book) with glue and glued scrap material such as fabric or paper.

(transitive, now rare, of a dog) To copulate with, to impregnate.

plural of line

(film, theater) Words spoken by the actors. / (fortifications) Dispositions made to cover extended positions, and presenting a front in but one direction to an enemy.