Drawdown

noun

1. The act of reduction or depletion.
2. The result of reduction or depletion.
3. A change in hydraulic head in a well or other body of water.
4. A measure of the decline from a historical peak in some variable, typically the cumulative profit or total open equity of a financial trading strategy.
5. The process of a bank releasing previously agreed loan amount to the borrower, hence making it available for them to use.