searchlight /ˈsɜːtʃˌlaɪt/noun 2verb 1forms 4 noun2 •A light source that projects a bright beam of light in any direction, generally for military use. •The light from the above source.We didn’t know where Reserve Gully was as the shore was all in darkness except for a searchlight from a warship which played occasionally on top of Walker’s Ridge. — 1933 verb1 •To scan or sweep across like a searchlight.A dozen air corps of fireflies searchlighted the spot for an instant. — 1937 formssearchlighted · searchlit · searchlighting · searchlights