light bulb noun
plural ∼ bulbs [count] : a glass bulb or tube that produces light when it is supplied with electricity
▪ change a light bulb that has burned out —called also bulb
▪ change a light bulb that has burned out —called also bulb
a light bulb goes off/on
chiefly US, informal ◊When a light bulb goes off/on (in your head), you suddenly understand something or have a great idea.
▪ After thinking about the problem for several days, a light bulb went off in her head, and she knew how to solve it.
▪ After thinking about the problem for several days, a light bulb went off in her head, and she knew how to solve it.
