HSK 7-9
胡思乱想
húsī-luànxiǎng(idiom) to indulge in flights of fancy; to let one's imagination run wild
失眠时她容易胡思乱想。
Shī mián shí tā róng yì hú sī luàn xiǎng.
When she cannot sleep, her thoughts tend to run wild.
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Appears across levels (7-9) in the HSK 3.0 word list.