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

1.
잉여인간, 불필요한 사람
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.
그들의 로맨틱한 저녁 식사에서 나는 잉여인간처럼 느껴졌다.
•
When they started talking about their inside jokes, I knew I was the fifth wheel.
그들이 자기들끼리 농담을 시작했을 때, 나는 내가 잉여인간이라는 것을 알았다.