line-of-sight adjective 2line of sight noun 2forms 2 adjective2 •(of a weapon) Having an attack whose hitbox is a very or infinitely thin line or dot that goes along a straight path. •(of a weapon's attack) Having such a hitbox. line of sight noun2 •A straight line along which an observer has a clear view. •The line which passes through the front and rear sight, at any elevation, when they are sighted at an object. formslines of sight · lines-of-sight