rearguard

美 [ˈrɪrˌɡɑrd]
英 [ˈrɪə(r)ˌɡɑː(r)d]
  • n.后卫部队
  • 网络殿军;后备军;后护板
复数:rearguards  
rearguard
n.
1.
后卫部队a group of soldiers that protect the back part of an army especially when the army is retreating after it has been defeated

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