heav ‧ y ‧ weight /ˈheviweɪt/ BrE AmE noun [countable]
1 . someone or something that is very important or has a lot of influence:
one of the heavyweights of the movie industry
2 . a ↑ boxer who weighs more than 86.18 kilograms, and who belongs to the heaviest weight class of boxers