1. to know; to be aware (of); to be conscious (of); to learn (of); to find out; to discover

2. to sense; to feel; to notice; to realize

3. to understand; to comprehend; to grasp; to appreciate

4. to remember; to be familiar with; to be acquainted with

5. to experience; to go through; to know (e.g. hardship)

6. to get acquainted with (a person); to get to know

7. to have to do with; to be concerned with; to be one's concern; to be one's responsibility (usu. with neg. sentence)