The Collaborative International Dictionary of English v.0.48:

accroach \ac*croach"\ ([a^]k*kr[=o]ch"), v. t. [OE. acrochen,
   accrochen, to obtain, OF. acrochier, F. accrocher; [`a] (L.
   ad) + croc hook (E. crook).]
   1. To hook, or draw to one's self as with a hook. [Obs.]
      [1913 Webster]

   2. To usurp, as jurisdiction or royal prerogatives.
      [1913 Webster]

            They had attempted to accroach to themselves royal
            power.                                --Stubbs.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "accroach":
   adopt, annex, appropriate, arrogate, assume, colonize, commandeer,
   confiscate, conquer, encroach, enslave, expropriate, hog, indent,
   infringe, invade, jump a claim, make free with, make use of,
   monopolize, occupy, overrun, play God, preempt, preoccupy,
   prepossess, pretend to, requisition, seize, sequester, sit on,
   squat on, subjugate, take, take all of, take it all, take over,
   take possession of, take up, trespass, usurp