Entrench

Verb

1. To cut in; to furrow; to make trenches in or upon. To dig or excavate a trench; to trench. To surround or provide with a trench, especially for defense; to dig in.

   "The army entrenched its camp, or entrenched itself."

2. To dig or excavate a trench; to trench.
3. To surround or provide with a trench, especially for defense; to dig in.

   "The army entrenched its camp, or entrenched itself."

4. .mw-parser-output .defdate{font-size:smaller} 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. To establish a substantial position in business, politics, etc.

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

5. 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.