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(Military) a type of warfare in which opposing armies face each other in entrenched positions
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|Noun||1.||trench warfare - a struggle (usually prolonged) between competing entities in which neither side is able to win; "the hope that his superior campaigning skills would make a difference evaporated in the realization that electioneering had become a form of trench warfare"|
|2.||trench warfare - a type of armed combat in which the opposing troops fight from trenches that face each other; "instead of the war ending quickly, it became bogged down in trench warfare"|