A long, narrow ditch or hole dug in the ground.

A narrow excavation as used in warfare, as a cover for besieging or emplaced forces.

A pit, usually rectangular with smooth walls and floor, excavated during an archaeological investigation.

(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.