The mirror of rising-wedge. Price makes lower lows, but each new low is barely lower while the bounces stay contained. Selling pressure is fading even though the chart still points down.
It resolves on a close above the upper boundary, often with a sharp move because the pattern compresses volatility before it breaks. In a downtrend it is a potential reversal; in an uptrend it is a continuation-pattern after a pullback.
Like all wedges, it depends on how the lines are drawn and is easy to see in hindsight. Pair it with something independent, such as volume-dry-up into the apex or a hidden-divergence, rather than trading the shape alone.
Related: rising-wedge, volatility-contraction-pattern, continuation-pattern, trendline, hidden-divergence