过街老鼠

guò jiē lǎo shǔguojielaoshu

1. sb or sth detested by all
2. target of scorn
3. anathema
4. cf. 老鼠過街，人人喊打|老鼠过街，人人喊打[lao3 shu3 guo4 jie1 , ren2 ren2 han3 da3]

Study it in Yanamino