Dead cat bounce

A 'dead cat bounce' is a rather unpleasant term used to describe a small, short term recovery in a falling market's price. A temporary recovery from a prolonged decline or bear market, after which the market continues to fall.

Why?

Well, they say a falling cat always lands on its feet. But if a cat fell from the top of a very tall building it would still die, whether it lands on its feet or not. The "bounce" is the illusion of the cat having survived the fall.