bury (someone's) nose in (a book)

Translations
погрузиться (кому-то) в (книгу)
She loves to bury her nose in a book whenever she has free time.
Она любит погружаться в книгу, когда у нее есть свободное время.
Definitions
To be deeply engrossed in reading a book, often to the exclusion of everything else happening around.