WordReference Random House Learner's Dictionary of American English © 2020
en•trench /ɛnˈtrɛntʃ/USA pronunciation   v. [+ object]
  1. to place in a position of strength;
    establish firmly:The yearly marathon was firmly entrenched in the city.
en•trench•ment, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
en•trench  (en trench),USA pronunciation v.t. 
  1. to place in a position of strength;
    establish firmly or solidly:safely entrenched behind undeniable facts.
  2. Militaryto dig trenches for defensive purposes around (oneself, a military position, etc.).

  1. to encroach;
    infringe (usually fol. by on or upon):to entrench on the domain or rights of another.
Also,  intrench. 
  • en-1 + trench 1545–55
    • 1.See corresponding entry in Unabridged settle, ensconce, set, implant, embed.

Collins Concise English Dictionary © HarperCollins Publishers::
entrench, intrench /ɪnˈtrɛntʃ/ vb
  1. (transitive) to construct (a defensive position) by digging trenches around it
  2. (transitive) to fix or establish firmly, esp so as to prevent removal or change
  3. (intr; followed by on or upon) to trespass or encroach; infringe

enˈtrenched, inˈtrenched adj
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