What Am I Riddles

Question: I'm not a pool, a tree, a slave, a website, or a shirt.

What am I?

Question: I give refuge to the blind and repeat everything they say.

What am I?

Question: I join you in battle, fist clenched tight.
We pound three times with all our might.
If my rival decides he will sign for peace;
I'll crush him, and the fight will cease.
But if he lays his hand down flat;
I'll suffer defeat, that is that.

What am I?

Question: I can go up a chimney down but not down a chimney up?

What am I?

Question: I attach to your hip and I sing all day.
All I want to do is play.