Intrench

verb

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

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

3. To establish a substantial position in business, politics, etc.

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

4. 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.
5. To cut in; to furrow; to make trenches in or upon.