to say nothing of

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to say nothing of (someone or something)

Not even considering or mentioning the significance or impact of someone or something else; not to mention (someone or something). It will take me at least two hours to fix this part of the fence, to say nothing of repairing all of it. Their newborn will be difficult enough to take care of while they're away, to say nothing of their temperamental toddler.
See also: nothing, of, say, to
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

to say nothing of someone or something

not to even mention the importance of someone or something. John and Mary had to be taken care of, to say nothing of Bill, who would require even more attention. I'm having enough difficulty painting the house, to say nothing of the garage that is very much in need of paint.
See also: nothing, of, say, to
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

to say nothing of

see under not to mention.
See also: nothing, of, say, to
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.

to say nothing of

And there is no need to mention. Used to allude to things that fill out an idea or argument: The yard is a mess, to say nothing of the house.
See also: nothing, of, say, to
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
While everyone would admit that the anti-urban is one tradition, to claim it is the only one or even the dominant one hardly does justice to Ralph Waldo Emerson, Walt Whitman, Henry James, or William Dean Howells in the nineteenth century, to say nothing of home-grown modernists like Waldo Frank, Kenneth Burke, Hart Crane, and Lewis Mumford in the twentieth century (to name only a few).
In all his seamlessly executed objects, Ray fixates on how and why things happen, to say nothing of wondering what really does happen in the field of vision, and how such events might be remade as art.
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Artistically, her precedents lie not only in esthetic prototypes but in automutilative performance artists like Chris Burden, Stelarc, and Gina Pane; socially, her work is not that much more extreme than the experiments punks and "modern primitives" perform on themselves, to say nothing of what Cindy Crawford wannabes must put themselves through.
That is, while the initial cost of a full-blown flexible ring gauge may be on the order of $500,000 and a single hard-tooled gauge $120,000, the difference is not only in the need for multiple conventional ring gauges for a single vehicle (consider a four-door), but the fact that it can take six months to obtain a hard-tooled gauge and three months for a flex system, to say nothing of the fact that reconfiguration costs are a fraction of buying new gauges for a different or modified door design.--GSV
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