home truth

home truth idiom
A key or basic truth, especially one that is discomforting to acknowledge. For example, It's time you told a few home truths here, such as where your campaign finances actually came from. This expression uses home in the sense of “the very heart of a matter.” [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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