| Definitions | | fifth wheel |
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noun
- 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.
- A very large truck trailer; an 18-wheeler.
- A very large trailer that is towed with a pickup truck.
- (idiom) Anything superfluous or unnecessary.
- As the third person along on their date, I felt like a .
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