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Definition of rearguard noun from the Oxford Advanced Learner's Dictionary

rearguard

noun
 
/ˈrɪəɡɑːd/
 
/ˈrɪrɡɑːrd/
(usually the rearguard)
[singular + singular or plural verb]
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  1. a group of soldiers that protect the back part of an army especially when the army is retreating after it has been defeated
    • Even the rearguard was/were in full retreat.
    opposite vanguard
    Word Originlate Middle English (denoting the rear part of an army): from Old French rereguarde.
See rearguard in the Oxford Advanced American Dictionary

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