WordNet (r) 3.0 (2006):

unsnarl
    v 1: extricate from entanglement; "Can you disentangle the
         cord?" [syn: disentangle, unsnarl, straighten out]
         [ant: entangle, mat, snarl, tangle]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "unsnarl":
   arrange, break loose, break out, clarify, clear, clear up,
   cut loose, disburden, disembarrass, disembroil, disencumber,
   disengage, disentangle, disintricate, disinvolve, dislodge, extend,
   extricate, flatten, free, free up, get out, liberate, order,
   put in order, put in shape, put straight, put to rights, ravel,
   rectify, reduce to order, release, right, set in order,
   set straight, set to rights, sit up, smooth, sort out, stand up,
   straighten, straighten out, straighten up, tear loose, unbend,
   unbraid, unclutter, uncoil, uncurl, unkink, unknot, unmix, unravel,
   unscramble, untangle, unthread, untwine, untwist, unweave, unwind,
   whip into shape