Noun
falling knife (plural falling knives)
(trading) A stock whose price has dropped rapidly.
Watch the grown ups all twirling with the clock throughout the day. Watch them spinning through the hours while the time hands tick away. They talk and grip the world, as they would catch a falling knife. Reality deceives them 'neath amusing games of life. Dawud Wharnsby
Buying a home wouldn't make much sense if house prices were likely to decline further; no one wants to catch a falling knife. Mark Zandi