fortify, dig in, barricade, protect; see defend 1, surround 2.
encroach, infringe, invade; see meddle 1.
"entrench." YourDictionary, n.d. Web. 13 December 2018. <https://thesaurus.yourdictionary.com/entrench>.
entrench. (n.d.). Retrieved December 13th, 2018, from https://thesaurus.yourdictionary.com/entrench
To implant so deeply as to make change nearly impossible:
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