The 2008 stock market crash wiped out many investors.
Tips
usage
Originally a finance term (stock/futures market crash), now used colloquially for anything falling apart - a server 崩盘, a relationship 崩盘, a student's mood 崩盘 before exams.
memory
崩 = to collapse, 盘 = a board/plate (here, the trading board). Picture the big red trading board collapsing in on itself.