What do you mean by volume rebound?

A large turnover means that there are many people buying and selling that day, which leads to a large turnover. The turnover rate is high.

The rebound is only relative to the falling stock. Stocks that have fallen every day, when they reach a certain decline, will have funds to come in and bargain-hunting. If more people buy, the supply will be short and the stock will go up. This is the relationship between supply and demand. Then there will be a rebound.

If the inventory quantity exceeds the demand, then the inventory will drop.