Chart notes|$Q |4-hour MACD|Bullish crossover below the zero line
First, the definitions: A golden cross occurs when DIF crosses above DEA; a death cross occurs when DIF crosses below DEA. In other words, the histogram bars change from negative to positive or from positive to negative.
How to read it: The bars often start shrinking before a crossover appears, so some people treat this as an early sign of weakening momentum. However, this signal is also more prone to failure.
All indicators describe past price movements, and prices can certainly move in the opposite direction.