Definition 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>
Examples of let alone
<I don't have enough money for a new car, let alone a luxury sedan.>
First Known Use of let alone
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Thesaurus: All synonyms and antonyms for "let alone"
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