1. I accidentally knocked over the vase and had to sop up the water with a paper towel.2. The old lady was knocked down by a bus as she crossed the street.
 knock over something knock somebody downknock over something = 把某東西碰倒，例如碰倒花瓶knock him down = 把他碰倒，例如他被車子碰倒或撞倒
This popular movie star is protected by his three bodyuards 24-7.