Definition of trench noun from the Oxford Advanced Learner's Dictionary

     

    trench

     noun
    noun
    BrE BrE//trentʃ//
     
    ; NAmE NAmE//trentʃ//
     
     
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  1. 1a long deep hole dug in the ground, for example for carrying away water Workmen were digging a trench beside the road.
  2. 2a long deep hole dug in the ground in which soldiers can be protected from enemy attacks (for example in northern France and Belgium in the First World War) life in the trenches trench warfare
  3. 3(also ocean trench) a long deep narrow hole in the ocean floor
  4. Word Origin late Middle English (in the senses ‘track cut through a wood’ and ‘sever by cutting’): from Old French trenche (noun), trenchier (verb), based on Latin truncare ‘to maim’.Extra examples life in the trenches in the First World War He spoke movingly of his time in the trenches during the First World War. They are digging a trench to hold a water pipe which will divert water from the river. They had not been prepared for the horrors of trench warfare.
See the Oxford Advanced American Dictionary entry: trench