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通宵达旦
通宵達旦
tōngxiāodádàn
1. overnight until daybreak (idiom); all night long
2. day and night

Character Breakdown

通
tōng
to pass through, to open, to connect; to communicate; common
HSK 4 10 丶
宵
xiāo
night, evening, darkness
HSK 6 10 丶
达
dá
to reach, to arrive at; intelligent
HSK 5 6 丶
旦
dàn
dawn; morning; day
HSK 5 5 丶

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