let alone
conjunctionDefinition of let alone
: to say nothing of : not to mention
—used especially to emphasize the improbability of a contrasting example he would never walk again let alone play golf — Sports Illus.how many ever see an Ambassador or Minister, let alone a President— Robert Lacville
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“Let alone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/let%20alone. Accessed 5 Mar. 2021.
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Time Traveler for let alone
The first known use of let alone was in 1765
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