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Adverb: let alone  let u'lown
  1. Used to indicate that something is even less likely or appropriate than something previously mentioned
    "she can't boil potatoes, let alone cook a meal";
    - not to mention, never mind
Verb: let alone  let u'lown
  1. Refrain from changing, disturbing or taking
    - leave, leave alone, leave behind, never mind

Derived forms: let alone

Type of: forbear, refrain