pig in a poke, buy a
Buy a pig in a poke is a confusing phrase to many, mainly because people aren’t quite sure what is meant by poke. Poke is a dialectal term for bag or sack; in the US, the word tends to be found in the Appalachian region. So to buy a pig in a poke is make a blind purchase, to buy something sight unseen. The word poke dates to c.1300 when it appears in The Lay of Havelok the Dane:
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Hise pokes fulle of mele an korn.
(His pokes are full of meal and corn.)
Copyright 1997-2013, by David Wilton