Trenching meaning : (usually followed by upon) To invade, especially with regard to the rights or the exclusive authority of another; to encroach. (infantry) To excavate an elongated pit for protection of soldiers and or equipment, usually perpendicular to the line of sight toward the enemy. To excavate an elongated and often narrow pit. To have direction; to aim or tend. To cut; to form or shape by cutting; to make by incision, hewing, etc. To cut furrows or ditches in. To dig or cultivate very deeply, usually by digging parallel contiguous trenches in succession, filling each from the next. The excavation of a trench. Trenchant