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English definition of “let”

let

adverb     /let/
let alone C1 used after a negative statement to emphasize how unlikely a situation is because something much more likely has never happened: Some people never even read a newspaper, let alone a book.Connecting words joining words or phrases with similar or related meanings
(Definition of let adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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