Definition of fifth wheel
1a : a horizontal wheel or segment of a wheel that consists of two parts rotating on each other above the fore axle of a carriage and that forms support to prevent tippingb : a similar coupling between tractor and trailer of a semitrailer
2 : one that is superfluous, unnecessary, or burdensome
Examples of fifth wheel in a Sentence
He felt more and more like a fifth wheel at the office.
First Known Use of fifth wheel
FIFTH WHEEL Defined for English Language Learners
Definition of fifth wheel for English Language Learners
: an extra person who is not needed in a group
Seen and Heard
What made you want to look up fifth wheel? Please tell us where you read or heard it (including the quote, if possible).