Apedia

Wheel Extra Person He'll Unneeded Proverb France 16th

Idiom Fifth Wheel
Example If he comes with us, he'll just be a fifth wheel.
Meaning an unneeded, extra person
Origin This is a proverb that was first used in France in the 16th century. A unicycle has one wheel; a bicycle has two wheels; a tricycle has three wheels; and wagons and cars have four wheels. No vehicle needs five wheels. The fifth wheel is a surplus thing, good for nothing. In the same way, if two couples are going out on a double date, an extra person who tags along could be called a "fifth wheel."

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