The breakdown in talks between Sun Microsystems and I.B.M. speaks volumes about the high hurdles to deal-making in today's depressed deal environment, The Deal Professor says.
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it makes an opinion, characteristic, or situation very clear…
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]