extenuating circumstances

extenuating circumstances idiom
A situation or condition that provides an excuse for an action, as in Although Nancy missed three crucial rehearsals, there were extenuating circumstances, so she was not dismissed. This expression was originally legal terminology, denoting circumstances that partly excuse a crime and therefore call for less punishment or damages. [c. 1600]

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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