black gold
Raw petroleum; crude oil.
Meaning adapted from Wiktionary, available under CC BY-SA 4.0.
“Many countries rely on black gold for their energy needs.”
“The economy of the region depends heavily on the extraction and sale of black gold.”
“Throughout the twentieth century, nations frequently engaged in complex geopolitical maneuvers to secure steady access to the world's supply of black gold.”
From black and gold, in reference to the dark colour of the substances and the significant market value they represent. The term has been applied to crude oil, coal, and black pepper.
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black babies
Third-world charities, the missions.
- 02
black day
A day of great disaster, misfortune or unhappiness.
- 03
black hat
A villain in a story, especially in a Western (a film or other work of the Western genre).
- 04
black mark
Something that negatively affects someone's reputation.
- 05
black market
Trade that is in violation of restrictions, rationing, or price controls.
- 06
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.
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black oxide
Any 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.
Last updated August 10, 2026