背 城 借 一 bèi chéng jiè yī : make a last-ditch stand before the city wall; fight to the last ditch; put up a desperate struggle

逼 上 樑 山 bī shàng liáng shān : be driven to join the Liangshan Mountain rebels; be driven to revolt; be forced to do something desperate

病 急 亂 投 醫 bìng jí luàn tóu yī : turn to any doctor one can find when critically ill - try anything when in a desperate situation

不 得 了 bù dé liǎo : desperately serious; disastrous; extremely; exceedingly

不 可 終 日 bù kě zhōng rì : be unable to carry on even for a single day; be in a desperate situation

危 急 wēi jí : critical; desperate (situation)