rear guard

柯林斯词典

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. (尤指戰場上軍隊撤退時的)後衛部隊['the' N]
2. PHRASE 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. 負隅頑抗; 最後一搏[journalism]
Mr. Lin looks increasingly like someone fighting a rearguard action to keep their job. 林先生越來越像是爲了保住自己的工作而作最後一搏的那些人。