black diamond
noun/ˌblæk ˈdaɪmənd/
/ˌblæk ˈdaɪmənd/
- [countable] (British English, informal) a piece of coal
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- [uncountable, countable] a dark form of diamond
- [countable] (North American English) a slope that is difficult to ski down
- a black diamond run
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black diamond