Have (one's) nose in a book informal
Said when someone reads books all the time
Whenever I come to visit Jenny's house, I notice that she always has her nose in a book.
He is a really bookworm. He always has his nose in a book.
read a book comfortably
The verb "have" should be conjugated according to its tense.
Children or adults often say this phrase to get their friends to join in something, especially to jump into a swimming pool (pond, lake, etc.)
“Last one in is a rotten egg!” yelled Jane, jumping into the pool.