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Fifth Wheel (Noun)

An extra car wheel and tire for a four-wheel vehicle.

Nouns denoting man-made objects.

The fifth wheel in the trunk came in handy when we got a flat tire on the highway.
If you have a full-size spare tire, you won't need to stop at a service station for repairs as quickly as if you only had a donut, but the extra wheel can be bulky.
You'll want to check your vehicle's owner's manual to find out where the fifth wheel is located.
Our roadside emergency kit includes a spare tire, which serves as a fifth wheel for our sedan.
To be on the safe side, the car manufacturer includes a fifth wheel and tire as part of the purchase package.

Someone or something that is unwanted and unneeded.

Nouns denoting attributes of people and objects.

The new employee was considered a fifth wheel in the team, as their role was redundant and didn't add any value to the project.
After the merger, many employees felt like a fifth wheel, struggling to find their place in the new company structure.
The old computer was a fifth wheel in the office, taking up space and serving no purpose.
As the only single person in a group of couples, Sarah felt like a fifth wheel on the vacation.
The extra feature on the new smartphone was considered a fifth wheel by many users, who didn't see the point of having it.

A steering bearing that enables the front axle of a horse-drawn wagon to rotate.

Nouns denoting man-made objects.

The fifth wheel was a crucial component of the horse-drawn carriage, allowing for smooth turns and navigation of tight corners.
The old horse-drawn wagon had a rusty fifth wheel that creaked and groaned as it turned.
To fix the broken wagon, the blacksmith carefully crafted a new fifth wheel to replace the damaged one.
As the horse pulled the wooden cart, the fifth wheel spun silently, facilitating a smooth ride over the bumpy terrain.
The team of horses pulling the royal carriage had to navigate a tight turn, but the sturdy fifth wheel allowed for a precise and effortless maneuver.