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To lose focus or stop paying attention to something, usually unintentionally. I think I must have zoned out during that lecture, because when it was over I realized I didn't remember anything the professor said. Jerry kind of zones out when he plays video games, so you have to be really loud to get his attention.
1. mod. alcohol or drug intoxicated. What’s the matter with your eyes? Get a little zoned last night?
2. mod. exhausted. After a day like this, I’m really zoned.