$ETERNAL A failed trendline breakdown occurs when the price briefly falls below a well-defined trendline but quickly moves back above it, indicating that sellers could not sustain the downward move. This false breakdown often traps bearish traders and signals strong buying interest, especially when accompanied by higher trading volume and a close back above the trendline. If the price then continues to form higher highs and higher lows, the failed breakdown can act as a bullish reversal signal, suggesting that the prevailing uptrend is likely to resume.