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Jyutping hoi6 kwan4 zi1 maa5
Pinyin hài qún zhī mǎ

Definitions (CC-CEDICT)
  1. lit. a horse that brings trouble to its herd (idiom)
  2. fig. troublemaker
  3. black sheep
  4. rotten apple
Definitions (粵典–words.hk)
  1. 名詞
    行為​惡劣​而​影衰​成個​群​體​嘅​人​(​量​詞​:​個​/​隻​)
    literally, "horse harming the whole herd"; evil member that brings disgrace to the group; black sheep
    • 就係你依個害群之馬唔肯練歌,搞到我哋贏唔到歌唱比賽喇!
      就系你依个害群之马唔肯练歌,搞到我哋赢唔到歌唱比赛喇!
      zau6 hai6 nei5 ji1 go3 hoi6 kwan4 zi1 maa5 m4 hang2 lin6 go1, gaau2 dou3 ngo5 dei6 jeng4 m4 dou2 go1 coeng3 bei2 coi3 laa3!
      You are such a black sheep! It is you who refused practicing that makes us failed to win the singing contest.
Examples (粵典–words.hk)
  1. Cantonese
    就系你依个害群之马唔肯练歌,搞到我哋赢唔到歌唱比赛喇!
    就係你依個害群之馬唔肯練歌,搞到我哋贏唔到歌唱比賽喇!
    zau6 hai6 nei5 ji1 go3 hoi6 kwan4 zi1 maa5 m4 hang2 lin6 go1, gaau2 dou3 ngo5 dei6 jeng4 m4 dou2 go1 coeng3 bei2 coi3 laa3!
    • You are such a black sheep! It is you who refused practicing that makes us failed to win the singing contest.