I, etc. won't bite

(one) won't bite (someone)

You have no reason to be afraid of someone; this person is not going to hurt you, so don't be shy about approaching or talking to them. Don't worry, child, I won't bite. I just wanted to give you a message to pass along to your father. This is your Uncle Jack, son. Well, go on and shake his hand, he won't bite you.
See also: bite

I, etc. won’t ˈbite (you)

(humorous) used to tell somebody that they do not need to be afraid of somebody: You should tell your teacher that you don’t understand — she won’t bite you!
See also: bite