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English definition of “black belt”

black belt

noun [C]    
the symbol of a very high standard in the sport of judo or karateMartial arts someone who has received a black belt as a symbol of achieving a very high standard in judo or karate: He's a black belt at karate.Martial arts
(Definition of black belt noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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