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brummish

ˈbrummish, a. low.
  [f. Brum, slang contraction of Brummagem + -ish.]
  Of coin: Of counterfeit character, doubtfully genuine.

1805 G. Colman John Bull, Brit. Theat. 55 Two guineas..one seems light, and t'other looks a little brummish.

Oxford English Dictionary

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