Green’s Dictionary of Slang

shrap n.

[SE shrape, bait of chaff or seed laid for birds; hence a snare]

(UK Und.) wine used to weaken the will of a confidence trickster’s victim.

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[UK]Greene Blacke Bookes Messenger 3: A Table of the words of Art lately deuised by Ned Browne and his associates, to Crosbite the old Phrases used in the manner of Conny-catching. [...] The wine to be called, the Shrap.