死馬當作活馬醫 [－马当－－马医]

Jyutping sei2 maa5 dong1 zok3 wut6 maa5 ji1
Pinyin sǐ mǎ dàng zuò huó mǎ yī

Definitions (Wiktionary)
  1. verb, idiomatic
    to make a forlorn effort to rescue a hopeless situation; to make a Hail Mary pass
    (syn.) 死馬當活馬醫, 死马当活马医