catch a falling knife

verb — 2 senses

verb

Business, Finance, Trading Idiomatic To buy a financial instrument whose price is falling rapidly.

Buying that stock now would be catching a falling knife. Wait until you see capitulation.

Business, Finance, Trading Idiomatic To buy a financial instrument with the unconfirmed assumption that its price will reverse.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.