in a world of your own
US /ɪn ə wɜrld əv jʊər oʊn/
UK /ɪn ə wɜrld əv jʊər oʊn/

1.
in zijn/haar eigen wereld, in gedachten verzonken
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.
Ze is vaak in haar eigen wereld, dromend over haar volgende roman.
•
He was so deep in a world of his own that he didn't hear me call his name.
Hij was zo diep in zijn eigen wereld dat hij me niet hoorde roepen.