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English definition of “heavyweight”

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heavyweight

noun [C] uk   /ˈhev.ɪ.weɪt/ us  
a boxer who weighs more than 175 pounds (79.5 kilograms) and is therefore in the heaviest group: Mike Tyson was heavyweight champion of the world. a person or thing that is important or serious and that other people notice: Her extraordinary intelligence and speaking ability made her a political heavyweight.
(Definition of heavyweight from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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