人云亦云

rén yún yì yún

to say what everyone says (idiom)

to conform to what one perceives to be the majority view; to follow the herd

人

rén

person; people

云

yún

abbr. for Yunnan Province 雲南省|云南省[Yun2 nan2 Sheng3]

亦

yì

also

云

yún

abbr. for Yunnan Province 雲南省|云南省[Yun2 nan2 Sheng3]