falling knife 一买就套的股票（股市用语）
英文释义
An investment lowering in price that can cause harm to investors who try to grab it as it falls.
The famous company is a falling knife, and, although shares are cheap right now, if I buy any I know I will lose money.
这家知名公司是一买就套的股，尽管目前价格便宜，但如果我买了，肯定要亏钱。