know

Fetched 2026-10-28 (live).

Datamuse reports no synonyms or antonyms for this word.

Verb

1. To perceive the truth or factuality of; to be certain of; to be certain that.
   • I know that I’m right and you’re wrong.
   • He knew something terrible was going to happen.
2. To be or become aware or cognizant.
   • Did you know Michelle and Jack were getting divorced? ― Yes, I knew.
   • Malware's sometimes been known to sit dormant for a long time.
3. 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.
4. To be acquainted (with another person).
5. To be acquainted or familiar with; to have encountered.
   • I know your mother, but I've never met your father.
   • Borja, do you know Pilar? - Sure, we've actually met before.
   • I got to know her during the pandemic, so we've known each other for years now.
6. 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'.
7. To experience.
   • Their relationship knew ups and downs.
8. 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.
9. 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.
10. To recognize as the same (as someone or something previously encountered) after an absence or change.
11. 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.
12. To be able to play or perform (a song or other piece of music).
    • Do you know "Blueberry Hill"?
13. To have indexed and have information about within one's database.
14. To maintain subject to a given philosophical definition of knowledge; to hold a justified true belief.

Noun

1. Knowledge; the state of knowing.
2. Knowledge; the state of knowing. (Now confined to the fixed phrase in the know.)

Noun

1. Alternative form of knowe (“hill, knoll”).

Particle

1. Used at the end of a sentence to draw attention to information one thinks the listener should keep in mind.
   • Make sure you water the plants, know…
   • I was a naval diver know!
2. Synonym of you know (used as a conversational discourse marker, to emphasize something)

Source: Wiktionary · CC BY-SA 3.0 (Wiktionary) · cached copy, not a rewrite.