What does it really mean to be reckoned with?

Question

Do you know who Oprah is? Yeah, and she is one to be reckoned with.

Answer 1

It means that she is the one that you have to face.

Answer 2

its somebody who will strip a situation bare and let everyone see the truth

Answer 3

This a term from the Bible. The Reckoning is when God

shall judge all man, and Evil will be dealt with. Today, anyone

who has to answer to someone else for an action that they have done is refered as 'reckoning' to that person. As an example, George Bush has to reckon with God, and the American People.