fifth wheel

US /ˌfɪfθ ˈwiːl/
UK /ˌfɪfθ ˈwiːl/
"fifth wheel" picture
1.

عجلة خامسة, شخص زائد عن الحاجة

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.
شعرت وكأنني عجلة خامسة في عشاءهم الرومانسي.
When they started talking about their inside jokes, I knew I was the fifth wheel.
عندما بدأوا يتحدثون عن نكاتهم الداخلية، علمت أنني كنت العجلة الخامسة.