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lightweight (adj.)

also light-weight, 1809, from the noun (1773 in horse-racing, also in pugilism), "man or animal of a certain weight prescribed by rule," from light (adj.1) + weight (n.). Figurative sense of "inconsequential" first attested 1809. The noun sense of "person of little importance or accomplishment" is from 1885.

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Definitions of lightweight from WordNet
1
lightweight (n.)
a professional boxer who weighs between 131 and 135 pounds;
lightweight (n.)
someone who is unimportant but cheeky and presumptuous;
Synonyms: whippersnapper / jackanapes
lightweight (n.)
an amateur boxer who weighs no more than 132 pounds;
lightweight (n.)
a wrestler who weighs 139-154 pounds;
2
lightweight (adj.)
weighing relatively little compared with another item or object of similar use;
a lightweight fabric
lightweight wood
lightweight (adj.)
having no importance or influence;
a lightweight intellect
From wordnet.princeton.edu