un·pick /ˌʌnˈpɪk/
  (vt.)拆開,割開,拆散
  Un·pick v. t.  To pick out; to undo by picking.
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  unpick
       v 1: become or cause to become undone by separating the fibers or
            threads of; "the sweater unravelled" [syn: unravel, unknot,
             unscramble, untangle] [ant: ravel, ravel]
       2: undo (the stitches) of (a piece of sewing)