Source : Webster's Revised Unabridged Dictionary (1913)

Accroach \Ac*croach"\, 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.]

   2. To usurp, as jurisdiction or royal prerogatives.

            They had attempted to accroach to themselves royal
            power.                                --Stubbs.