1736 Canting Dictionary / B / BLANK [adj]
down looked, sheepish, guilty.
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Blank in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).