To make a gross miscalculation, especially anything sports related; as in John Dyson's grave mistake in interpreting the D/L score in the West Indies vs England ODI that took place on 20 March 2009 causing the W.I. to lose a match that they could have easily won.
Rishi: "Rajiv thought that the Trinidad and Tobago team had already qualified for the knockout stage so he bought a box seat ticket for the match. But they didn't make it to that round."
Shavak: "Whoa. I guessed he pulled a dyson."
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