in one's own world
idiom
: 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 his own (little) world and didn't seem to hear what I was saying.
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“In one's own world.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20one%27s%20own%20world. Accessed 26 Nov. 2024.
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