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Jyutping coeng4 dou2 zung3 jan4 teoi1
Pinyin qiáng dǎo zhòng rén tuī

Definitions (Wiktionary)
  1. proverb
    Everyone will seize the opportunity to attack a person when he or she loses power or influence

牆倒眾人推 [墙-众--]

Jyutping
Pinyin qiáng dǎo zhòng rén tuī

Definitions (CC-CEDICT)
  1. lit. when a wall is about to collapse, everybody gives it a shove (idiom)
  2. fig. everybody hits a man who is down