explain away

explain away idiom
Dismiss or minimize the importance of something, especially something detrimental. For example, “His words were taken down, and though he tried to explain them away, he was sent to the Tower” (Thomas Macaulay, The History of England, 1855). [c. 1700]

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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