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English definition of “let up”

let up

(STOP) informal phrasal verb with let     /let/ verb (present participle letting, past tense and past participle let)
to stop doing something that you have been doing continuously or in a determined way: Neil spent the entire evening moaning about his job - he just wouldn't let up. The police insist that they are not letting up on their campaign against drugs .Stop having or doing something
(Definition of let up (STOP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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