black belt

Meanings

1. The highest belt colour in various martial arts.
2. Someone who has attained the black belt in martial arts.
3. Great skill in any field.
4. A senior manager who is expert in one of various management systems such as Six Sigma or DMAIC and acts in a project leader or mentor role.

1. A geographic region where the residents are predominantly or exclusively African-American.
2. A roughly crescent-shaped geological formation of dark fertile soil in the Southern United States.

1. Alternative letter-case form of black belt.

Etymology

Calque of Japanese 黒帯 (kuroobi)