in a world of one's own

idiom

Definition of in a world of one's own

: spending so much time thinking about something that one does not notice what is happening I tried to talk to him, but he was in a world of his own and didn't seem to hear what I was saying.

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“In a world of one's own.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20a%20world%20of%20one%27s%20own. Accessed 28 Sep. 2020.

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