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Related to much less: Much less than
1. A lot less. We've had much less foot traffic since construction started. This magazine has much less content than it used to.
2. And especially not; and even less so. The phrase is used to indicate that something is especially not the case, even less so than what was previously mentioned. We don't have enough money for new car, much less a luxury SUV. He barely looked at me, much less smiled.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
And certainly not, as in He rarely talks about his outside activities, much less his family. The earliest record of this idiom is in John Milton's Paradise Lost (1671): "The world thou hast not seen, much less her glory."
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.
even/much/still ˈlessand certainly not: I don’t want even to see her, much less speak to her. ♢ I don’t like beer, even less do I like warm, weak English beer.
Farlex Partner Idioms Dictionary © Farlex 2017
Certainly not: I'm not blaming anyone, much less you.
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.