NASK, or Naskin,
a Prison or Bridewell. The new Nask, Clerkenwell Bridewell: Tuttle Nask, the Bridewell in Tuttle-Fields: He napt it at the Nask; he was lasht at Bridewell.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Nask in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).