A combination of the words is and it.
Is it raining outside? Or, IS’T raining outside?
by Is’t October 31, 2019
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The contraction of the words is it.
Guy 1: hey, what time Is’t

Guy 2: I’m sorry, what?
Guy 1: Is’t. It’s a contraction of the words is and it. Don’t you know anything about Shakespeare?

Guy 2: I’m such a loser
by Is’t for the win November 22, 2020
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