zone out

(verb) to lose one’s concentration or fall asleep

Example Sentences:

A: Wow! What a movie! Did you like it?
B: Sorry, I zoned out during the second half. It was so boring!

Every time I’m in that professor’s class, I zone out.

The teacher noticed that her students were zoning out, so she changed the lesson to something more exciting.

From the Blogs:

Stuff to tune in to and Zone out on for May 5th

Media:

Similar idioms:

1. zone someone out
2. change one’s tune
3. the apple doesn’t fall far from the tree