To suffer a sudden and drastic fall from grace or a change in fortune, often implying a woman falling into a life of disrepute; to go from a sheltered life to a degraded one.
她本是书香门第的大家闺秀，却因家道中落，飘籓坠溷，令人唏嘘不已。
She was originally a well-bred young lady from a scholarly family, but due to her family's decline, she suffered a drastic fall in circumstances, which was truly lamentable.
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