A situation that occurs when prices break above resistance, but soon reverse course and break back below resistance. Prices are said to “thrust” up, but cannot maintain the upward momentum and soon decline. The upthrust can also be referred to as a failed (bullish) signal and is considered bearish. Generally, the reversal should occur within 1-3 days of the resistance breakout for the failed signal to be considered valid. This is the opposite of a spring.