zone out

phrasal verb·1 sense·particle out

Meanings

1

Stop paying attention because you are tired or distracted

Why “out”? Going outward until nothing remains. Supply is gone.

I zoned out during the lecture.
I stopped paying attention during the lecture because I was tired.
Sam zoned out on the bus.
Sam stopped paying attention on the bus because he was tired.

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I zoned out during the lecture. What does it mean?

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