meaning of 'have at it'

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi everybody,

Came across this new to me expression:

A: Oh … mind if I look around your house a little?
B: Have at it.

Now, I figured that it means roughly “knock yourself out”, but I’m not sure other natives are cognizant of this expression.
So, do you know it?

Thanks![/u]

2

Yes I do, and yes, it does have the same inference,

3

doesn’t this mean something like “do it, go ahead”?

4

That would be my definition of it, Sergey.

5

There is an idiom: Have at it, and have it. = do it and you get it.

6

Thank you!