Triple-witching Definition
noun
(finance) Simultaneous expiry on US markets of stock index futures, stock index options, and stock options, which took place on the third Friday of March, June, September, and December. (With the introduction of single stock futures those days are now quadruple witching.)
Wiktionary
Origin of Triple-witching
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The idea of witching for these days is from the unusual patterns of trading that can occur ahead of the contract expiries.
From Wiktionary
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