A zone is any area set apart from another area.

Zone out.

Let's hear what Ana and Jonathan have to say about this one.

So, like I was saying, I sent her.

Jonathan?

Jonathan, what are you doing?

Oh, sorry, Ana.

I guess I zoned out for a second there.

I was thinking about all the trout I hope to catch on our fishing trip.

Well, stop.

We have a three hour drive to the lake, and I have a lot of stuff to talk to you about.

To zone out means that you are not concentrating.

Your mind starts to think about other things rather than what you are doing or you daydreams like Jonathan.

He zoned out thinking about all the fish he wants to catch on his fishing trip with honor.

And that's English in a minute.