trench - definition and synonyms

noun [countable] 

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  1. 1
    a long narrow open hole dug in the ground
  2. 2
    a trench used by soldiers to protect themselves from enemy attack
    1. a.

      the trenches

      [plural] the system of trenches in northern France and Belgium used by soldiers during the First World War

      His great-grandfather died in the trenches.

  3. 3
    a long narrow valley in the ground under the sea
     Synonyms and related words