She was lost in the world of the book.

Meaning: This sentence is about a woman who is reading a book and she is so focused on the book that she is not paying attention to anything else.

Choice of Words: Lost means unable to find one's way or to know where one is. World is the earth and all its countries and peoples. Book is a written or printed work consisting of pages glued or sewn together along one side and bound in covers.

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Related Expressions