Definitions
fifth wheel Tweet Definition of fifth wheel Like Definition of fifth wheel on Facebook
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. (idiom) Anything superfluous or unnecessary.
As the third person along on their date, I felt like a .

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