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Fifth Wheel
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fifth wheel
fifth wheel in a carriage which prevents tipping; spare wheel; something or someone that is unnecessary and burdensome
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Fifth wheel coupling
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fifth wheel
Noun
1. someone or something that is unwanted and unneeded
(synonym) deadwood
(hypernym) redundancy, redundance
2. an extra car wheel and tire for a four-wheel vehicle
(synonym) spare
(hypernym) car wheel
3. a steering bearing that enables the front axle of a horse-drawn wagon to rotate
(hypernym) bearing
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Fifth Wheel
Load supporting plate mounted to frame of vehicle. Pivot mounted, it contains provisions for accepting and holding the kingpin of a semi-trailer, providing a flexible connection between the tractor and the trailer. (TII1) (TII2)
A device mounted on a truck tractor or similar towing vehicle (e.g., converter dolly) which interfaces with and couples to the upper coupler assembly of a semitrailer. (49CFR393) (ATA2)
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fifth wheel
(See a fifth wheel)
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