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lightbulb

/ˈlaɪtˌbʌlb/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about lightbulb at Wordnik → Where our words come from →

  1. Electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity.

Origin

Calque from Cantonese 電燈泡/电灯泡 (din6 dang1 paau1), as though the third person is a light bulb in the background.

From Wiktionary, via Kaikki.org (CC BY-SA)