DAWB,
a Bribe, a Reward for secret Service; as, The Cull was gybbed, because he could not dawb. The Rogue was punished, because he had no Pence to bribe off his Sentence.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
The Vulgar Tongue originally collected by Grose, 1811.
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).