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.