The Bank Nifty experienced significant volatility on the day of the weekly expiry, maintaining a bearish trend as long as it stays below the key level of 48000. The index, however, managed to sustain above its 20-day moving average (20DMA) support at 47688. It is crucial for the index to hold this level, as a decisive break below it could intensify the selling pressure in the market. Traders should closely monitor the movements around 48000 and 47688 for potential trend changes and trading opportunities.