fifth wheel
US /ˌfɪfθ ˈwiːl/
UK /ˌfɪfθ ˈwiːl/

1.
orang ketiga, pihak yang tidak diperlukan
a person who is in a situation where they are not needed or are superfluous
:
•
I felt like a fifth wheel on their romantic dinner.
Saya rasa seperti orang ketiga dalam makan malam romantis mereka.
•
When they started talking about their inside jokes, I knew I was the fifth wheel.
Apabila mereka mula bercakap tentang jenaka dalaman mereka, saya tahu saya adalah orang ketiga.