Longman Dictionary of Contemporary English homepage

Topic: OCEANOGRAPHY

Date: 1300-1400
Language: Old French
Origin: trenche 'act of cutting', from trenchier 'to cut', probably from Latin truncare; TRUNCATE

trench

noun
     
trench [countable]
1 a long narrow hole dug into the surface of the ground:
Workers dug a trench for gas lines.
2 technicalHEO 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
4

the trenches

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.
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