Advertisement

light bulb (n.)

also lightbulb, 1884, from light (n.) + bulb (n.). Changing one as figurative of something easy to do is from 1920s; jokes about how many of a certain type it takes to change one date from 1971.

Others Are Reading

Advertisement
Definitions of light bulb from WordNet

light bulb (n.)
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity;
Synonyms: lightbulb / bulb / incandescent lamp / electric light / electric-light bulb
From wordnet.princeton.edu