合不拢嘴合不攏嘴

hé bù lǒng zuǐ

Meaning

unable to conceal one's happiness, amazement, shock etc; grinning from ear to ear; mouth agape; gobsmacked

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Characters

合héto combine, to join, to unite; to gather亼口不bùno, not, un-; negative prefix一拢lǒngto collect, to bring together扌龙嘴zuǐmouth, lips口觜