FROE,
for Vrowe, (Dutch) a Wife, Mistress, or Whore, Brush to your Froe (or Blos) and wheedle for Crap, whip to your Mistress, and speak her fair to give, or lend you some Money.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Froe in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).