One of the mysteries of the English language finally explained.
1rare A foul-mouthed person; a slanderer. Now rare.
2Attributive Designating the black-mouthed dogfish, Galeus melastomus.
3United States Regional United States regional. The chinook salmon, Oncorhynchus tshawytscha; specifically an immature one.
Mid 17th century. From black + mouth.
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