What is a bearish engulfing?
A bearish engulfing is the mirror of the bullish version: a green (up) candle is followed by a red (down) candle whose body completely engulfs it. Buyers had control; one session later sellers erased the entire advance and closed below its start.
At a rally high the pattern is a footprint of distribution — demand pushed price up, and supply absorbed all of it and more. Late longs from the green candle are immediately underwater, and their stops below feed the follow-through.
As with all candlestick signals, location does the heavy lifting: a bearish engulfing into resistance, after a parabolic run, or at a lower high inside a downtrend is meaningful; one inside quiet chop is not.