1N-SING (尤指战场上军队撤退时的)后卫部队 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. (尤指战场上军队撤退时的)后卫部队
2PHRASE 负隅顽抗;最后一搏 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. 负隅顽抗;最后一搏 [journalism]
Mr Urban looks increasingly like someone fighting a rearguard action to keep their job.