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

1.
di dunianya sendiri, tenggelam dalam pikiran
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.
Dia sering berada di dunianya sendiri, bermimpi tentang novel berikutnya.
•
He was so deep in a world of his own that he didn't hear me call his name.
Dia begitu tenggelam dalam dunianya sendiri sehingga dia tidak mendengar saya memanggil namanya.