D defs.my
Entry 3 senses Webster, 1913

entrench

/ĕn-trĕnch'/ · en·trench · IPA /ɛnˈtɹɛnt͡ʃ/
01 v. t. To surround with a trench or with intrenchments, as in fortification; to fortify with a ditch and parapet. Same as intrench.
  1. 1.
    To surround with a trench or with intrenchments, as in fortification; to fortify with a ditch and parapet. Same as intrench.(Mil.) See: intrench
  2. 2.
    to establish in a position from which dislodgement is difficult; to place firmly in a strong position.
  3. 3.
    To cut in; to furrow; to make trenches in or upon.
Syn. intrench.