HSK 7-9
眉开眼笑
méikāi-yǎnxiàobrows raised in delight, eyes laughing (idiom); beaming with joy; all smiles
奶奶收到来信后眉开眼笑。
Nǎinai shōudào láixìn hòu méikāiyǎnxiào.
Grandma beamed with joy after receiving the letter.
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Appears across levels (7-9) in the HSK 3.0 word list.