know

This little verb has one of the great prehistoric careers in English. Long before English was English, speakers were already using a *gno- word for “knowing,” and that same ancient family turns up in diagnosis, gnosis, recognize, and even cousin forms like cognizant. Old English spelled it cnāwan, with that stubborn initial cn- cluster that later wore down to the modern, plain-spoken know. Shakespeare’s audience would still have heard the biblical sense of “know” as sexual intimacy, which is why the word can sound almost shockingly blunt in Genesis 4:1. So every time you say I know, you’re using a verb that has been around since people were sorting reality from rumor with nothing but memory, gossip, and a very old instinct for pattern.