|Origin:||trenche 'act of cutting', from trenchier 'to cut', probably from Latin truncare; TRUNCATE|
a long narrow hole dug into the surface of the ground:
Workers dug a trench for gas lines.
a long narrow valley in the ground beneath the sea
3PMA [usually plural]
a deep trench dug in the ground as a protection for soldiers:
the trenches of World War I
the place or situation where most of the work or action in an activity takes place:
Lane left teaching after 30 years in the trenches.