en·trench /ɪnˈtrɛnʧ, ɛn-/
  (vt.)圍以壕溝,防護,保衛,使盤踞(vi.)掘壕,侵犯
  en·trench 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.
  3. To cut in; to furrow; to make trenches in or upon.
  Syn: -- intrench.
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  entrench
       v 1: fix firmly or securely [syn: intrench]
       2: impinge or infringe upon; "This impinges on my rights as an
          individual"; "This matter entrenches on other domains"
          [syn: impinge, encroach, trench]
       3: occupy a trench or secured area; "The troops dug in for the
          night" [syn: dig in]