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throw the book at

throw the book at idiom

Punish or reprimand severely, as in I just knew the professor would throw the book at me for being late with my paper. This expression originally meant “sentence a convicted person to the maximum penalties allowed,” the book being the roster of applicable laws. Its figurative use dates from the mid-1900s.

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.