Answer:
You cannot keep me until you have given me. What am I?
I can never be stolen from you. I am owned by everyone. Some have more some have less.
I carry you down a gentle stream.
What gets sharper the more you use it?
What force and strength cannot get through, I with my unique teeth can do. What am I?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?