What is the meaning of Sticks his or her nose into a book?

The phrase "sticks his or her nose into a book" means to become absorbed in reading. It implies that the person is so engrossed in the book that they are oblivious to their surroundings.

Here are some synonyms:

* Buried in a book

* Lost in a book

* Devoured the book

* Engrossed in reading

For example:

* "The little girl was so stuck into her book that she didn't even notice her mom walk in."

* "He stuck his nose into a book and was gone for the rest of the afternoon."

The phrase is often used to describe someone who loves to read and finds it difficult to put a book down once they start reading.