Dictionary/不知天高地厚

不知天高地厚

bù zhī tiān gāo dì hòu

ㄅㄨˋ ㄓ ㄊㄧㄢ ㄍㄠ ㄉㄧˋ ㄏㄡˋ
Idiom
1not to know the immensity of heaven and earth
2an exaggerated opinion of one's own abilities