crack a book

crack a book idiom
Open a book to study or read, as in He passed the exam without cracking a book. This expression employs the verb to crack in the sense of “to open,” a slang usage that dates from the early 1700s. [Colloquial; c. 1930]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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