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rear guard

noun \-ˈgärd, -ˌgärd\

Simple Definition of rear guard

  • : a group of soldiers who are placed at the back of an army and who protect the army from being attacked from behind

Source: Merriam-Webster's Learner's Dictionary

Full Definition of rear guard

  1. :  a military detachment detailed to bring up and protect the rear of a main body or force

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