A trendline range breakout happens when price has been moving within a confined range while respecting a trendline (forming higher lows or lower highs), and then breaks out of both the trendline and the range boundary. This indicates a shift from consolidation to expansion, showing that accumulated buying or selling pressure is now strong enough to push price beyond its previous limits. Such breakouts often lead to sharp directional moves, especially when accompanied by strong candles, rising volume, and acceptance above the range, confirming the start of a new trend or continuation of the larger trend.