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blue book

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blue booknoun
pluralblue books
blue book
noun
pluralblue books
Learner's definition of BLUE BOOK  
[singular]  : a report that is published by the government
[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
[singular]US  : a book that lists the current value of items (such as used cars)
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