介绍:
【Third wheel】
-Well if you are bringing your girlfriend, I'll invite my cousin along so I don't become a third wheel.
-Don't be a third wheel and try to give the couple some space.
-If you are watching your friend make out with his girlfriend there is a pretty good chance you are a third wheel.
Definition: A person hanging out with two people (usually a couple) that are leaving him/her out.
Etymology: Having any odd number of wheels on an object will cause imbalance.
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Other examples:
1. Fearing the awkwardness of entertaining a work partner all by herself, she invited me to be the third wheel for the arranged dinner.
2. She had always thought herself as being the third wheel until he proposed to her and not to her best friend.
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