不知天高地厚
bùzhītiāngāodìhòu
not to know one's own limits; arrogant and ignorant
Every meaning
bùzhītiāngāodìhòu
- not to know one's own limits; arrogant and ignorant
Its characters
Words with 不
Words with 知
Meanings from our own dictionary. Chengyu from the Xinhua idiom list, the most common first.