Of prices of commodities, stocks, etc.: to fall suddenly or sharply. Originally U.S.

intransitive. Of a commodity, price, currency, etc.: to drop sharply in value or amount.

intransitive. To fall rapidly in value, amount, or price: said esp. of stocks. Commercial slang.

Of stocks, values, etc.: to fall heavily or suddenly. Also with †off. (Cf. slump, n.2 1.)

figurative. To follow an incorrect or unprofitable course; to make a mistake, to err or fail. Also of prices, etc.: to fall or decline rapidly. collo…