Archaic British slang meaning wealthy or well-off — having plenty of coins. The term dates from earlier centuries and is no longer in active use. It fits the pattern of older money-related slang ('flush,' 'loaded') but with a more literal, coin-specific construction. Occasionally surfaces in period literature.
He was known around town as a coiny fellow, never short of a round for his friends.
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(archaic, slang) wealthy; rich.
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