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1.
1. To cross one's arms.

2. To fold down vertical branches in a hedge and weave them together, like folded arms, to restructure the hedge.
He pleached his arms...
by Lofty Heights July 20, 2011
 
2.
some one who is very good at many things, most commonly used in poker. a pleach gets many good hands and can bluff very well. if you have a pleach at your table they will most likley win.
Man they guy just got 3 royal flushes in a row, what a pleach. Cash me out.
by Paul February 13, 2005