Definizione e Significato di "third wheel"

What is the origin of the idiom "third wheel" and when to use it?

The idiom "third wheel" originates from the world of transportation. In the early days of bicycles, tricycles, and other wheeled vehicles, it was common for a third, smaller wheel to be added for stability. When applied figuratively, the term refers to a person who feels left out or superfluous in the company of a couple, similar to the way an extra wheel on a bicycle might seem unnecessary and awkward. The third wheel often feels like they are intruding on an intimate or exclusive situation.

What is the origin of the idiom "third wheel" and when to use it?

The phrase "to third wheel" originates from the concept of a third wheel on a vehicle, which is an extra wheel used for stability or support. In social contexts, particularly in the realm of romantic relationships, "to third wheel" means to be an extra, unnecessary, or unwanted person in the company of two individuals who are romantically involved. The term likely emerged in informal language usage to describe the feeling of being out of place in such situations.