Comprehensive resource for understanding and mastering English idioms
The idiom "third wheel or fifth wheel" is used to describe someone who is not an essential part of a group or situation, but rather a hindrance or annoyance to others. This person may be superfluous or unnecessary, and their presence can cause tension or discomfort in the overall dynamic.
The idiom "third wheel" originated in the late 19th century, according to the Oxford English Dictionary. It was used originally to describe someone who hung around uninvited or unwelcome, and caused discomfort or distress to others. The expression likely evolved from the idea that a third person could cause tension or awkwardness in a romantic setting or social gathering. The idiom "fifth wheel" is less commonly used and may have originated as an extension of the "third wheel" concept, emphasizing the idea of being superfluous or unnecessary. Overall, both expressions share a similar meaning of someone who is not essential to a group or situation, but rather causes discomfort or hindrance to others.