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Jyutping sei2 maa5 dong3 wut6 maa5 ji1
Pinyin sǐ mǎ dàng huó mǎ yī

Definitions (CC-CEDICT)
  1. lit. to give medicine to a dead horse (idiom)
  2. fig. to keep trying everything in a desperate situation
Definitions (Wiktionary)
  1. phrase, idiomatic
    to keep trying everything in a desperate situation; to resort to desperate measures in desperate times
    (syn.) 死马当作活马医, 死馬當作活馬醫
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)