falling knife
Noun
Meaning
falling knife (plural falling knives)
(trading) A stock whose price has dropped rapidly.
Examples
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.
Buying a home wouldn't make much sense if house prices were likely to decline further; no one wants to catch a falling knife.