A "third wheel" refers to a person who is present in a social situation, typically involving a couple, but is not part of the romantic relationship. This term often describes someone who feels out of place or awkward when accompanying two people who are romantically involved. The third wheel may feel like an outsider, as the couple focuses on each other rather than on their companion. The concept of a third wheel can occur in various settings, such as friend gatherings, dates, or social events. While it can sometimes lead to feelings of loneliness, it can also provide opportunities for friendship and connection, as the third wheel may bond with one or both members of the couple.