Third-wheel
Origin
From third wheel.
Full definition of third-wheel
Verb
- (ambitransitive) To act as a third wheel; to accompany two people on a date.
- 2018-07-28, Dave Quinn, Meghan Markle and Prince Harry 'Found Each Other to Change the World,' Says Couple's Pal, The Argentine polo star, Ralph Lauren model and personal pal to Harry was with the royal couple on Thursday as he and Harry’s polo team scored the winning trophy at the Sentebale ISPS Handa Polo Cup. He even third-wheeled the newlyweds as the pair shared a congratulatory kiss after the charity match, a hilarious moment caught by photographers.