What does the word trench mean?

Usage examples for trench

  1. I should never have thought of that tunnel in the world if the trench hadn't suggested it. – The House of a Thousand Candles by Meredith Nicholson
  2. A trench may begin in the ruins of a house, may run up out of a ditch; may be cut into a rise of ground sheltered under a hill, and is built in many ways by many men. – Tales of War by Lord Dunsany
  3. We're going to start on the trench tomorrow. – Wanderers by Knut Hamsun