WIDOWS-Weeds,
mourning Cloaths. A Grass-Widow; One that pretends to have been married, but never was, yet has Children.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Widow’s Weeds in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).