The book was her best friend.

Meaning: This means that the person had a deep connection with the book and found solace, enjoyment, or valuable lessons within its pages.

Choice of Words: Book is a collection of written or printed pages that are bound together and covered. Best friend is a person who is very close to you and whom you trust and enjoy spending time with. When you combine these words, you get the idea that the book was a source of comfort, support, and companionship for the person.

Alternative Expressions

Related Expressions