JQ== - YWRkbGUgZWdn
- know one's mind
- know one's onions
- know one's own business
- know one's own limitations
- know one's own mind
- know one's place
- know someone in and out
- know someone's mind
- know something by experience
- know something from experience
- know the law
- know the length of someone's foot
- know the ropes
- know the score
- know the seamy side of life
- know the time of day
- know the way one knows the back of one's hand
- know the world
- know to one's own cost
- know two things apart
