just deserts

just deserts idiom
A deserved punishment or reward, as in He got his just deserts when Mary jilted him. This idiom employs desert in the sense of “what one deserves,” a usage dating from the 1300s but obsolete except in this expression.

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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