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heavyweight

also heavy-weight, noun and adjective, 1857 of horses; 1877 of fighters; from heavy (adj.) + weight. Figuratively, in reference to importance, from 1928.

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Definitions of heavyweight from WordNet

heavyweight (n.)
an amateur boxer who weighs no more than 201 pounds;
heavyweight (n.)
a wrestler who weighs more than 214 pounds;
heavyweight (n.)
a professional boxer who weighs more than 190 pounds;
heavyweight (n.)
a very large person; impressive in size or qualities;
Synonyms: giant / hulk / whale
heavyweight (n.)
a person of exceptional importance and reputation;
Synonyms: colossus / behemoth / giant / titan
From wordnet.princeton.edu