entrench

verb

1. (ambitransitive, literally)To cut in; to furrow; to make trenches in or upon.

   “It was this very sword entrenched it.”

   “His face Deep scars of thunder had entrenched.”

2. (ambitransitive, literally)To cut in; to furrow; to make trenches in or upon.
3. (ambitransitive, literally)To cut in; to furrow; to make trenches in or upon.

   “The army entrenched its camp, or entrenched itself.”

   “To the south were the Varden and the men of Surda, entrenched behind multiple layers of defense, where they displayed a fine panoply of woven standards, ranks of proud tents, and the picketed horses of King Orrin's cavalry.”

4. (ambitransitive, figuratively)To become completely absorbed in and fully accept one's beliefs, even in the face of evidence against it and refusing to be reasoned with.
5. (ambitransitive, figuratively)To establish a substantial position in business, politics, etc.

   “Senator Cornpone was able to entrench by spending millions on each campaign.”

   “Given these entrenched ideological assumptions about the colonial order, it is no wonder that the state and those groups with an interest in the status quo viewed with suspicion and hostility any challenges to the fixed and "natural" boundaries between different sorts of people.”

   “For London to have its own exclusive immigration policy would exacerbate the sense that immigration benefits only certain groups and disadvantages the rest. It would entrench the gap between London and the rest of the nation. And it would widen the breach between the public and the elite that has helped fuel anti-immigrant hostility.”

6. (ambitransitive, figuratively)To invade; to encroach; to infringe or trespass; to enter on, and take possession of, that which belongs to another; usually followed by on or upon.