lightbulb

Pronunciation: /ˈlaɪtˌbʌlb/

The English word “lightbulb” has 1 meaning listed here.

noun

An uninvited third person joining a couple's date who prevents or hinders romantic interactions.

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

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.