Meaning of ‘Doze off’ Phrasal Verb in English

She dozed off while studying for the exam.

I can't help but doze off during long car rides.

The boring lecture made several students doze off.

If you doze off now, you won't be able to sleep tonight.

He tends to doze off when he's sitting in his favorite chair.

I was so tired during the movie that I dozed off in the middle.