GNU Collaborative International Dictionary of English

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Found one definition

1.       
   entrench (?), v. t.
   1. (Mil.) To surround with a trench or with intrenchments, as in fortification; to fortify with a ditch and parapet. Same as intrench.
   
   [1913 Webster]
   
   
   2. to establish in a position from which dislodgement is difficult; to place firmly in a strong position.
   
   [PJC]
   
   
   3. To cut in; to furrow; to make trenches in or upon.
   
   Syn. -- intrench.
   [1913 Webster]