老鼠過街，人人喊打 [－－过－－－－－－]

Jyutping lou5 syu2 gwo3 gaai1 , jan4 jan4 haam3 daa2
Pinyin lǎo shǔ guò jiē , rén rén hǎn dǎ

Definitions (CC-CEDICT)
  1. lit. when a rat crosses the street, people chase it down (idiom)
  2. fig. everyone detests a lowlife