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rearguard 
1  n-sing In a battle, the rearguard is a group of soldiers who protect the back part of an army, especially when the army is leaving the battle. 
2 If someone is fighting a rearguard action or mounting a rearguard action, they are trying very hard to prevent something from happening, even though it is probably too late for them to succeed.  (JOURNALISM) 
fight a rearguard action/ mount a rearguard action  phrase 
Mr Urban looks increasingly like someone fighting a rearguard action to keep their job.