black belt
noun [ C ] uk/ˌblæk ˈbelt/ us/ˌblæk ˈbelt/
（柔道或空手道运动中象征达到很高水平的）黑腰带
the symbol of a very high standard in the sport of judo or karate
（柔道或空手道运动中的）黑带级选手
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 in karate. 他是一名空手道黑带级选手。