Archaic British thieves' cant for an attractive or pretty woman. 'Dimber' meant handsome or pretty in the cant vocabulary of 17th and 18th-century English criminals, while 'mort' was the cant word for a woman. The compound was used admiringly rather than disparagingly, though it belongs entirely to historical criminal slang.
The bawdy song described a dimber mort who had the whole tavern under her spell.
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(archaic, UK, thieves) A pretty girl.
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