entrench /(?)/

en·trench

entrench

v. t.
  1. To surround with a trench or with intrenchments, as in fortification; to fortify with a ditch and parapet. Same as intrench. (Mil.)
  2. to establish in a position from which dislodgement is difficult; to place firmly in a strong position.
  3. To cut in; to furrow; to make trenches in or upon.