speak volumes

speak volumes idiom
Be significant, indicate a great deal, as in That house of theirs speaks volumes about their income. This idiom uses volumes in the sense of “the information contained in volumes of books.” [c. 1800]

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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