Definitions for triple witching hour
Random House Webster's College Dictionary
tri′ple witch′ing hour`(n.)
the last hour of trading on the New York Stock Exchange on the four Fridays each year when stock options, stock index futures, and options on such futures simultaneously expire: regarded as a time of extreme volatility in trading.
Origin of triple witching hour:
triple witching hour(Noun)
The final hour of trading during which three types of derivatives contracts expire.
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