Source : Webster's Revised Unabridged Dictionary (1913)

Entrench \En*trench"\, v. t.
   See {Intrench}.

Source : WordNet®

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}]