FIFTHWHEEL

fifth wheel

Noun

  1. A type of trailer hitch, which consists of a horseshoe-shaped plate on a multi-directional pivot, with a locking pin to couple with the kingpin of a truck trailer.
  2. A very large truck trailer; an 18-wheeler.
  3. A very large trailer that is towed with a pickup truck.
  4. Anything superfluous or unnecessary.
    As the third person along on their date, I felt like a fifth wheel.
    I felt like a fifth wheel when they started giggling and making out during dinner.


The above text is a snippet from Wiktionary: fifth wheel
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!