合不拢嘴
hé bù lǒng zuǐhebulongzui
- unable to conceal one's happiness, amazement, shock etc
- grinning from ear to ear
- mouth agape
- gobsmacked
hé bù lǒng zuǐhebulongzui
Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences