entrench

/ɪnˈtɹɛnt͡ʃ/ · verb

Meaning

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.
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.
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.

From en- + trench. First attested in the 1550s.

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