plural of fall line

(idiomatic, often figuratively) To delimit a boundary or border.

The official nickname for the state of Maryland in the United States of America.

plural of disassembly line

A slaughterhouse production line, where carcasses are strung up, and butchers successively process the same cuts progressively at each succeeding station, as the carcasses are pushed down the line.

(physics) A spectrum, typically produced by a luminous gas, that consists of separate lines typical of particular elements

(linear algebra) A linear functional.

An electric motor in which the equivalent of the stator and rotor are linear and parallel, normally one part is a vehicle and the other a track on which it moves

A permanent wrinkle on the forehead.

plural of worry line