1. know - Noun
2. know - Verb
Knee.
To perceive or apprehend clearly and certainly; to understand; to have full information of; as, to know one's duty.
To be convinced of the truth of; to be fully assured of; as, to know things from information.
To be acquainted with; to be no stranger to; to be more or less familiar with the person, character, etc., of; to possess experience of; as, to know an author; to know the rules of an organization.
To recognize; to distinguish; to discern the character of; as, to know a person's face or figure.
To have sexual commerce with.
To have knowledge; to have a clear and certain perception; to possess wisdom, instruction, or information; -- often with of.
To be assured; to feel confident.
Source: Webster's dictionaryHe who knows, does not speak. He who speaks, does not know. Laozi
It is better, of course, to know useless things than to know nothing. Seneca
You never know what is enough unless you know more than enough. William Blake
Listen to what they say about others, and you will know what they say about you. Cuban Proverb
You do not really know your friends from your enemies until the ice breaks. Icelandic Proverb
Better the devil you know (than the one you don't). English Proverb