Help me out here... If you have a single person hanging out with a couple, are they a third wheel or a fifth wheel?
I've always said fifth wheel because a fifth wheel is superfluous. A third wheel is a tricycle, which is a perfectly legitimate mode of transportation. But two critique partners, without talking to each other, just corrected me. Have I been wrong all this time?
cc/ @grammargirl
@jasonrush @grammargirl A 5th wheel is a kind of camper ;)
@tomwebster Also a perfectly legit mode of travel, maybe we need a whole new idiom!