From Longman Business Dictionarydouble-witchingˌdouble-ˈwitching (also double-witching hour) noun [singular] informal FINANCE a time on a financial market when two types of FUTUREs (=contracts to buy or sell shares etc at a fixed price on a fixed date) or OPTIONs (=rights to buy or sell shares etc at a fixed price within a fixed period of time) both EXPIRE (=reach the end of their life) at the same time → compare triple-witching
