殺君馬者道旁兒 [杀－马－－－儿]

Jyutping saat3 gwan1 maa5 ze2 dou6 pong4 ji4
Pinyin shā jūn mǎ zhě dào páng ér

Definitions (粵典–words.hk)
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殺君馬者道旁兒 [杀－马－－－儿]

Jyutping
Pinyin shā jūn mǎ zhě dào páng ér

Definitions (CC-CEDICT)
  1. lit. bystanders killed the king's horse (idiom) (based on an ancient story in which people along the road cheered a horseman on as he galloped past, until the horse died of exhaustion)
  2. fig. beware of becoming complacent when everyone is cheering you on