Definition of “let up” - English Dictionary

“let up” in British English

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let-upnoun [ C usually singular ]

uk /ˈlet.ʌp/ us /ˈlet̬.ʌp/ informal

a pause or reduction in something, usually something bad:

The airline authorities are not expecting a let-up in delays (= are not expecting delays to stop) for the rest of the summer.

(Definition of “let up” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“let up” in American English

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let up

phrasal verb with let us /let/ verb [ T ]

(esp. of something unpleasant) to become less strong or stop:

When the rain lets up we’ll go for a walk.

(Definition of “let up” from the Cambridge Academic Content Dictionary © Cambridge University Press)