unkindest cut

unkindest cut idiom
The worst insult, ultimate treachery, as in And then, the unkindest cut of all—my partner walks out on me just when the deal is about to go through. This expression was invented by Shakespeare in describing Julius Caesar's stabbing to death by his friends in Julius Caesar (3:2): “This was the most unkindest cut of all.”

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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