1. past tense of know; had knowledge or information about something
2. past tense of know; was familiar or acquainted with a person or place
3. past tense of know; had learned or memorized something

Examples

• She knew the answer to the difficult question.
• I knew him when we were children.
• They knew the city well after living there for years.
• He knew all the words to his favorite song.
• We knew it would rain because of the dark clouds.
• She knew French fluently after studying abroad.
• I knew something was wrong when he didn’t call.