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Jyutping wai4 ngai6 gau3 ziu6
Pinyin wéi wèi jiù zhào

Definitions (CC-CEDICT)
  1. lit. to besiege 魏[Wei4] and rescue 趙|赵[Zhao4] (idiom)
  2. fig. to relieve a besieged ally by attacking the home base of the besiegers
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to relieve a besieged ally by attacking the home base of the besiegers
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)