Bull trap
In stock market trading, a bull trap is an inaccurate signal that shows a decreasing trend in a stock or index has reversed and is now heading upwards, when in fact, the security will continue to decline. It is seen as a trap because the bullish investor purchases the stock, thinking it will increase in value, but is trapped with a poor performing stock whose value is still falling. See also 

Boom and bust
Dead cat bounce
Economic bubble
Market trend
Speculation
Stock market bubble

References 

 Setting the Bull Trap (investorinsight.com)
 Don’t Fight a Bull Trap (stocks-simplified.com)

Behavioral finance
Business cycle
Stock market
Financial crises