彈盡援絕 [弹尽－绝]

Jyutping daan2 zeon6 wun4 zyut6
Pinyin dàn jìn yuán jué

Definitions (CC-CEDICT)
  1. out of ammunition and no hope of reinforcements (idiom); in desperate straits
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to be in a desperate situation
  2. phrase, idiomatic
    to run out of ammunition as reinforcements are also not forthcoming