black belt:
(plural: ‘black belts‘)
Apart from other common meanings/definitions…
a black belt in a fighting stance
a person who holds a high rank in martial arts, such as karate, judo, etc., and is given a black cotton belt that is tied around his/her waist to show others that he/she is a martial artist of high degree,
a group of female black belts
e.g.
Don’t mess with her; she’s a judo black belt.
I had my karate lessons from a 3rd degree black belt.
Note: In the present martial art world, different styles of schools use different coloured belts to show the level or degree of achievement of their students.
To know more about the belt colours of martial artists, please click here.
