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(countable and uncountable) A colour like that of chocolate or coffee.
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(snooker, countable) One of the colour balls used in snooker, with a value of 4 points.
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(uncountable) Black tar heroin.
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(slang, archaic, countable) A copper coin.
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A brown horse or other animal.
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(sometimes capitalised, countable, informal, ethnic slur) A person of Latin American, Middle Eastern/North African, or South Asian descent; a brown-skinned person; someone of mulatto, or biracial appearance.
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(entomology) Any of various nymphalid butterflies of subfamily Satyrinae (formerly the family Satyridae).
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(entomology) Any of certain species of nymphalid butterflies of subfamily Satyrinae, such as those of the genera Heteronympha and Melanitis.
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(informal) A brown trout (Salmo trutta).
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(hunting, as "the brown") A mass of birds or animals that may be indiscriminately fired at.