Higher highs in price and lower highs in the oscillator which indicate a trend reversal from up to down.
Lower lows in price and higher lows in the oscillator which indicate a trend reversal from down to up.
Hidden Divergence:
Lower highs in price and higher highs in the oscillator which indicate a confirmation of the price trend which is down.
Higher lows in price and lower lows in the oscillator which indicate a confirmation of the price trend which is up.