Thou wost full little what thou meanest.
Chaucer.
We witen not what thing we prayen here.
Chaucer.
When that the sooth in wist.
Chaucer.
This verb is now used only in the infinitive, to wit, which is
employed, especially in legal language, to call attention to a
particular thing, or to a more particular specification of what has
preceded, and is equivalent to namely, that is to say.
Wit (?), n. [AS. witt, wit; akin to OFries. wit, G. witz, OHG. wizz,
Icel. vit, Dan. vid, Sw. vett. √133. See Wit, v.]