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defence in depth

British  

noun

  1. military the act or practice of positioning successive mutually supporting lines of defence in a given area

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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In addition, he says, military personnel always think in terms of "risk, defence in depth, layers of defence".

From BBC • May 22, 2025

In practice this has freed up Ukrainian soldiers to go and fight on the front line, knowing their cities have defence in depth.

From BBC • Mar. 24, 2022

There was much talk about defence in depth, which we in our innocence had thought had been universally adopted since the famous defence of Verdun by the French in 1916.

From The Fifth Battalion Highland Light Infantry in the War 1914-1918 by Morrison, F. L.

The first day's work consisted in re-organisation of the line, based upon the principle of defence "in depth."

From The Seventh Manchesters July 1916 to March 1919 by Wilson, S. J.