To cut in; to furrow; to make trenches in or upon.
source: Webster 1913
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; as, the king was charged with intrenching on the rights of the nobles, and the nobles were accused of intrenching on the prerogative of the crown.