entrenched

UK: /ɪnˈtrɛntʃt/

WordReference Random House Learner's Dictionary of American English © 2025

en•trench /ɛnˈtrɛntʃ/   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 © 2025

en•trench  (en trench′), v.t. 

1. to place in a position of strength;
   establish firmly or solidly:
   safely entrenched behind undeniable facts.
2. Military to dig trenches for defensive purposes around (oneself, a military position, etc.).

v.i. 

3. to encroach;
   trespass;
   infringe (usually fol. by on or upon):
   to entrench on the domain or rights of another.

Also, intrench. 

• en-¹ + trench 1545–55

Synonyms

• 1. settle, ensconce, set, implant, embed.

Collins Concise English Dictionary © HarperCollins Publishers::

entrench, intrench / ɪnˈtrɛntʃ/ verb

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 adjective