to fail suddenly or completely 突然失败；崩溃◆Talks between management and unions have collapsed. 管理层与工会的谈判已破裂。◆ Investors lost their money when the company collapsed. 公司倒闭时，投资者损失了钱财。
to decrease suddenly in amount or value （突然）降价，贬值；暴跌◆The company's stock market value has collapsed to under $10 million in the last year. 去年，公司的股票市值已降到 1000 万元以下。