In forex, turnover refers to the total amount of currency that is traded within a given time period. It is a measure of the level of trading activity in the forex market, and is typically expressed in terms of the dollar value of the trades that take place. High turnover in the forex market indicates that there is a lot of liquidity and trading volume, which can make it easier for traders to enter and exit positions. However, it can also lead to increased volatility and rapid price movements, which can pose risks for traders.