(anatomy, informal) The iliac furrows.

plural of plumb line

A phoneline reserved for phone sex.

plural of line printer

plural of line out

plural of Gunter's line

plural of bungee line

(idiomatic, soccer) To play as centre forward.

A line made up of dots or dashes, often used to indicate where you are supposed to sign a contract.

(aeronautics, astronomy) The altitude at which the atmosphere becomes too thin to support aerodynamic flight.