in a world of your own

US /ɪn ə wɜrld əv jʊər oʊn/
UK /ɪn ə wɜrld əv jʊər oʊn/
"in a world of your own" picture
1.

dans son propre monde, dans la lune

living in your own thoughts and imagination, often unaware of what is happening around you

:
She's often in a world of her own, dreaming about her next novel.
Elle est souvent dans son propre monde, rêvant de son prochain roman.
He was so deep in a world of his own that he didn't hear me call his name.
Il était tellement plongé dans son propre monde qu'il ne m'a pas entendu l'appeler.