third wheel
US /ˈθɜrd ˌwil/
UK /ˈθɜrd ˌwil/
1.
电灯泡, 多余的人
a person who is in a situation with two other people who are romantically involved or who are very close friends, making the third person feel awkward or unwanted
:
•
I felt like a third wheel on their date.
在他们的约会中，我感觉自己像个电灯泡。
•
They're always together, so I often feel like a third wheel when I'm with them.
他们总是形影不离，所以我跟他们在一起时常常觉得自己像个电灯泡。