fifth wheel

短语

半拖车接轮

发音

UK /ˌfɪfθ ˈʍiːl/
AU
UK /-ˈwiːl/
US /ˌfɪfθ ˈʍil/
US /-ˈwil/

词形变化

fifth wheels 复数 fifth wheels

别名

5th wheel

释义与例句

n.
  1. 1.

    A type of trailer hitch, which consists of a horseshoe-shaped plate on a multidirectional pivot, with a locking pin to couple with the kingpin of a truck trailer.

    美国 交通
  2. 2.

    A type of trailer hitch, which consists of a horseshoe-shaped plate on a multidirectional pivot, with a locking pin to couple with the kingpin of a truck trailer.

    In full, fifth-wheel trailer: a large caravan or travel trailer that is connected to a pickup truck for towing by a hitch similar to the one described in sense 1 located in the center of the truck's bed.

    美国 交通
  3. 3.

    A horizontal wheel or segment of a wheel above the front axle and beneath the body of a carriage, forming an extended support to prevent it from overturning.

    美国 历史 交通
  4. 4.

    Anything superfluous or unnecessary.

    灯泡

    灯泡儿

    电灯泡

    电灯泡儿

    美国 习语 非正式

    I felt like a fifth wheel when both of them started giggling and making out during dinner.

  5. 5.

    Anything superfluous or unnecessary.

    An unwanted person accompanying two couples on a double date.

    美国 习语 非正式

词汇关系

名词

同义词 2

spare deadwood

上位词 3

bearing redundancy redundance

词源

From the fact that since many vehicles such as carriages, coaches, wagons, prime movers, and trucks generally have four wheels on which they move, this component which resembles a wheel is the fifth. * (anything superfluous or unnecessary): Sense 3 refers to the fact that a fifth wheel is not needed for a four-wheeled vehicle to operate.

来源：wiktionary