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

 

rearguard action

 noun
noun
BrE
 
; NAmE
 
[usually singular]
 
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a struggle to change or stop something even when it is not likely that you will succeed They have been fighting a rearguard action for two years to stop their house being demolished.
See the Oxford Advanced American Dictionary entry: rearguard action