Q From Kirstin Cruikshank: Have you any idea where to wit came from?
A To wit is now just a fixed expression. It’s a shortened form of that is to wit meaning “that is to know; that is to say; namely”, from the English verb wit “to know”. This was a strong verb with past tense wot, as in “A garden is a lovesome thing, God wot”. In Old English it was spelt witan, and even further back it was linked with a Germanic verb meaning “to see”. In the first of these senses, it’s closely connected with the modern German verb wissen; in the second it’s the origin of our witness. It developed further to refer to a person’s understanding or judgement or mind (hence “keep your wits about you”).