1.
surrounded by enemies; completely isolated
Being in a situation where one is surrounded by opposition or hostility with no allies to turn to.
FOUR-CHARACTER IDIOM (四字熟語):
四面 (four sides/all directions) + 楚歌 (songs of Chu)
Etymology
From the story of 項羽 (Xiang Yu), a military leader in ancient China. When his army was surrounded by the forces of 劉邦 (Liu Bang), he heard the songs of his native 楚 (Chu) coming from the enemy camp—meaning even his own countrymen had abandoned him.
Usage
Describes being in a desperate situation with no support, especially when former allies have turned against you. Often used in business and political contexts.