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English definition of “let up”

let up

informal
verb uk phrasal verb with let   /let/ (present participle letting, past tense and past participle let) us  

(IMPROVE)

If bad weather or an unpleasant situation lets up, it stops or improves: When the rain lets up we'll go for a walk.

(STOP)

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.
(Definition of let up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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