HSK 7-9
翻来覆去
fānlái-fùqùto toss and turn (sleeplessly); again and again
他整夜翻来覆去无法入睡。
Tā zhěng yè fān lái fù qù wú fǎ rù shuì.
He tossed and turned all night, unable to fall asleep.
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Appears across levels (7-9) in the HSK 3.0 word list.