American English

Definition of trench noun from the Oxford Advanced American Dictionary



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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 World War I) life in the trenches trench warfare
  3. 3(also ocean trench) a long, deep, narrow hole in the ocean floor
See the Oxford Advanced Learner's Dictionary entry: trench