Technology / Aviation / Green Light: Approval for landing. A carryover expression from days when aircraft for the most part had no radios, and communication from a control tower was by means of a light-gun that beamed various green, red, and yellow signals to pilots in the air and on the ground. A popular phrase, '3 green lights,' refers to the instrument panel lights verifying that all three gears (in a tri-gear aircraft) are down and locked for safe landing.
Green Adjective Synonyms: verdant, grassy, fresh, leafy, rural, country-like
Light Adjective Synonyms: ignite, set alight, set or put a match to, kindle, burn, touch off, set fire to, fire
Light Verb Synonyms: turn on, switch on, put on
Light Noun Synonyms: illumination, brightness, daylight, lamplight, candlelight, firelight, gaslight, torchlight, starlight, moonlight, sunlight, gegenschein, counterglow
Entertainment / Ice Hockey / Red Light: A light behind the goal cage, next to the green light, that is turned on by the goal judge to indicate that a goal has been scored. MORE
Technology / Aviation / Navigation Lights: lights on the aircraft consisting of a red light on the left wing, a green light on the right wing, and a white light on the tail. FARs require that these lights be displayed in flight during the hour MORE