The unicyclist rode a bicycle with only one wheel.
Meaning: The person skilled at riding a vehicle with two wheels that is powered by the rider's legs traveled on a vehicle with only one wheel.
Choice of Words: Unicyclist is a person who rides a unicycle. Rode means to travel on a bicycle or other vehicle. Bicycle is a vehicle with two wheels that is powered by the rider's legs. Wheel is a round object that turns on an axle.
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Related Expressions