Meaning of “rearguard action” in the English Dictionary

british dictionary

(Definition of “rearguard action” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rearguard action" in American English

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rearguard actionnoun [ C ]

also rear-guard action, us /ˈrɪərˈɡɑrd ˌæk·ʃən/ us /ˈrɪərˈɡɑrd ˌæk·ʃən/

an effort to do something effective or get an advantage after the main effort has failed:

Supporters trying to keep the museum open are fighting a rear-guard action.

(Definition of “rearguard action” from the Cambridge Academic Content Dictionary © Cambridge University Press)