| 单词 | fifth wheel |
| 释义 | fifth wheel 1. a horizontal ring or segment of a ring, consisting of two bands that slide on each other, placed above the front axle of a carriage and designed to support the forepart of the body while allowing it to turn freely in a horizontal plane. 2. a similar device used as a coupling to connect a semitrailer to a tractor. 3. a similar coupling between a heavy-duty pickup truck and a camping trailer (fifth-wheel trailer) that extends over the bed of the truck. 4. an extra wheel for a four-wheeled vehicle. 5. a superfluous, unneeded, or unwanted person or thing: They enjoy making any outsider feel like a fifth wheel. [1870-75] |
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