lightweightсуществительное A person or thing that weighs relatively little. The new model of the phone is a lightweight compared to its predecessor.
A person who is not very strong or influential. Despite his ambitions, he was considered a political lightweight.
A weight class in boxing and other sports, typically for competitors weighing between 126 and 135 pounds. He won the championship in the lightweight division.
A competitor who fights in the lightweight weight class, especially in boxing or mixed martial arts. The lightweight delivered a stunning knockout in the second round.