trench warfare

noun
combat in which each side occupies a system of protective trenches.

Origin:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
trench warfare
 
n
a type of warfare in which opposing armies face each other in entrenched positions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  trench warfare
Part of Speech:  n
Definition:  a type of combat in which the enemies fight from a system trenches
Dictionary.com's 21st Century Lexicon
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American Heritage
Cultural Dictionary

trench warfare definition


Warfare marked by slow wearing down of the opposing forces and piecemeal gains at heavy cost. The term applies especially to World War I.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Alas, the result is a form of trench warfare in which neither side has advanced
  viable solutions to the obesity dilemma.
Big issues go unaddressed while political troops snipe at each other in
  gruelling trench warfare.
Right now it seems we're using the security equivalent of trench warfare to try
  to make us more secure.
Good government isn't a prize to be won through trench warfare.
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