entrench

Verb
  1. Fix firmly or securely (synset 201533813)
  2. Impinge or infringe upon (synset 202575705)
    "This impinges on my rights as an individual"; "This matter entrenches on other domains"
  3. Occupy a trench or secured area (synset 201533912)
    "The troops dug in for the night"

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