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in one's own world

Idioms

Also, in one's own little world; in a world of one's own. In deep thought or concentration. For example, Luanne was really in her own world at the meeting this morning, or Like many mathematicians, Bill lives in his own little world, or Bob's in a world of his own when he's listening to music. [Late 1500s]

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023