know (third-person singular simple present knows, present participle knowing, simple past knew or (nonstandard) knowed, past participle known or (colloquial and nonstandard) knew)
(transitive) To perceive the truth or factuality of; to be certain of or that.
I know that I’m right and you’re wrong.
He knew something terrible was going to happen.
(intransitive) To be or become aware or cognizant.
Did you know Michelle and Jack were getting divorced? ― Yes, I knew.
(transitive) To be aware of; to be cognizant of.
Did you know Michelle and Jack were getting divorced? ― Yes, I knew.
She knows where I live.
I knew he was upset, but I didn't understand why.
(intransitive, obsolete) To be acquainted (with another person).
(transitive) To be acquainted or familiar with; to have encountered.
I know your mother, but I’ve never met your father.
(transitive, archaic, biblical) To have sexual relations with. This meaning normally specified in modern English as e.g. to ’know someone in the biblical sense’ or to ‘know biblically.’
(transitive) To experience.
Their relationship knew ups and downs.
To understand or have a grasp of through experience or study.
Let me do it. I know how it works.
She knows how to swim.
His mother tongue is Italian, but he also knows French and English.
She knows chemistry better than anybody else.
Know your enemy and know yourself.
(transitive) To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.
to know a person's face or figure
to know right from wrong
I wouldn't know one from the other.
(transitive) To recognize as the same (as someone or something previously encountered) after an absence or change.
(intransitive) To have knowledge; to have information, be informed.
It is vital that he not know.
She knew of our plan.
He knows about 19th century politics.
(transitive) To be able to play or perform (a song or other piece of music).
Do you know "Blueberry Hill"?
(transitive) To have indexed and have information about within one's database.