black oxide
idiomAny of several coatings for steels or copper; some are oxides (mainly iron(II,III) oxide), some are nitrites or nitrates, and some are selenides; all are black; the main purposes are the antireflective and cosmetic effects; the anticorrosion effects are small.
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black babies
Third-world charities, the missions.
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black day
A day of great disaster, misfortune or unhappiness.
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black gold
Raw petroleum; crude oil.
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black hat
A villain in a story, especially in a Western (a film or other work of the Western genre).
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black mark
Something that negatively affects someone's reputation.
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black market
Trade that is in violation of restrictions, rationing, or price controls.
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black out
To censor or cover up by writing over with black ink.
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black over Bill's mother's
Describing rain-bearing dark clouds on the horizon.