blue book noun
plural ∼ books 1 [singular] : a report that is published by the government
▪ The information is listed in the blue book. 2 [count] US : a thin booklet with a blue cover and empty pages that is often used for writing the answers to test questions in college 3 [singular] US : a book that lists the current value of items (such as used cars)
▪ The information is listed in the blue book.
