Hi, Have a look at Clive's post in this old thread: Clive ... It is easy to dismiss the origin of the expression as, I am sorry to say, some of our leading dictionaries do, by attributing it to the draftsman's T-square, which is supposed to be an exact instrument, but the evidence indicates that the expression was in common English use before the T-square got its name. ' Beaumont used it in 1607, and it is probably that colloquial use long preceded his employment of the phrase...
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Clive... It is easy to dismiss the origin of the expression as, I am sorry to say, some of our leading dictionaries do, by attributing it to the draftsman's T-square, which is supposed to be an exact instrument, but the evidence indicates that the expression was in common Engli