- OK, then Saturday it is. : Ok, We''ll make it [the day we're going to go] Saturday. N it is (with N usually a noun string, possibly plural) is used in spoken English to confirm the choice / correctness of N. 'Saturday it is, then.' 'I've asked three maths teachers, and they all get the answer to be 42. 42 it is, then.' 'The only people who ... More @Wikipedia
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