Meaning of the word "fifth wheel" in English

What does "fifth wheel" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

fifth wheel

US /ˌfɪfθ ˈwiːl/
UK /ˌfɪfθ ˈwiːl/
"fifth wheel" picture

Idiom

1.

a person who is in a situation where they are not needed or are superfluous

Example:
I felt like a fifth wheel on their romantic dinner.
When they started talking about their inside jokes, I knew I was the fifth wheel.
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