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