To fill or be filled with air in an unintended cavity.
A top-facing opening to a cavity in the ground very near an ocean's shore, leading to a marine cave from which wave water or bursts of air are expelled.
The spiracle, on the top of the head, through which cetaceans breathe.
A vertical opening in the top of a computer case that lets hot air (primarily from the CPU heat sink) escape quickly.
A vent for the escape of steam or other gas.
An unintended cavity filled with air in a casting product.
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.
To excavate an elongated pit for protection of soldiers and or equipment, usually perpendicular to the line of sight toward the enemy.
To have direction; to aim or tend.
To cut; to form or shape by cutting; to make by incision, hewing, etc.
To excavate an elongated and often narrow pit.
To invade, especially with regard to the rights or the exclusive authority of another; to encroach.
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.
A trench coat.