“泡沫破灭”常见的英文表达是 “bubble burst” 。
例句:The real estate bubble finally burst, leading to a sharp decline in property prices.(房地产泡沫最终破灭了,导致房价大幅下跌。)
此外,还可以用 “bubble collapse” 来表达,不过 “bubble burst” 更为常用和口语化。