What Chicago mobsters and wanna-bes say when referring to someone who is privy to or has inside knowledge of mob business. Such individuals are said to be "on the know." It means basically the same thing as "in the know" but only in reference to rackets.

someone who comes off as knowing everything about everything, but upon review is mostly incorrect.

A person who simply doesn't know what's going on or being said around them.

With knowledge of something.

1)to have intimate knowledge of a particular subject not necessarily every subject.

2)to be privy to uncommon knowledge

in Biblical times, it meant to sleep with someone. you will see the word used in the Bible to mean that.

Absolute knowledge of the future said in past tense before it actually happens.