Cases of word usage

1) a strong blow or knock (bash)

2) an injury made by a blow or knock to the body or to a fruit, so that the skin is blue etc but not broken (bruise)

3) (an) injury or violent shaking or shock (to the brain) as caused by a blow, knock or fall (concussion)

4) to bring, throw, knock etc down (down-and-out)

5) (a game in which a ball is thrown to knock down) a number of bottle-shaped pieces of wood (each called a skittle) (skittles)

6) a low sound as of a knock on something heavy but soft (thud)

7) a condition of being ill; an unexpected result; to knock over; overturn; to cause (a person or thing) to be disturbed (upset)