合不拢嘴 hé bù lǒng zuǐ

DEFINITIONS

  1. unable to conceal one's happiness, amazement, shock etc
  2. grinning from ear to ear
  3. mouth agape
  4. gobsmacked

CHARACTERS

合 hé
HSK 4
combine, unite, join; gather
不 bù
HSK 1
no, not; un-; negative prefix
拢 lǒng
HSK 6
collect, bring together
嘴 zuǐ
HSK 3
mouth, lips