|1.||a deep ditch or furrow|
|2.||a ditch dug as a fortification, having a parapet of the excavated earth|
|3.||to make a trench in (a place)|
|4.||(tr) to fortify with a trench or trenches|
|5.||to slash or be slashed|
|[C14: from Old French trenche something cut, from trenchier to cut, from Latin truncāre to cut off]|
|trench (trěnch) Pronunciation Key
A long, steep-sided valley on the ocean floor. Trenches form when one tectonic plate slides beneath another plate at a subduction zone. The Marianas Trench, located in the western Pacific east of the Philippines, is the deepest known trench (10,924 m or 35,831 ft) and the deepest area in the ocean.