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English definition of “decline”

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decline

verb uk   /dɪˈklaɪn/ us  

decline verb (GO DOWN)

B2 [I] to gradually become less, worse, or lower: His interest in the project declined after his wife died. The party's popularity has declined in the opinion polls. formal The land declines sharply away from the house.
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decline verb (REFUSE)

B2 [I or T] formal to refuse: I invited him to the meeting but he declined. He declined my offer. [+ to infinitive] They declined to tell me how they had obtained my address.
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decline verb (GRAMMAR)

[I or T] specialized language If a noun, pronoun, or adjective declines, it has different forms to show if it is the subject or object, etc. of a verb or if it is singular or plural, etc. If you decline such a word, you list its various forms: In Latin we learned how to decline nouns.

decline

noun [S or U] uk   /dɪˈklaɪn/ us  
B2 when something becomes less in amount, importance, quality, or strength: industrial decline Home cooking seems to be on the/in decline (= not so many people are doing it). a decline in the number of unemployed She seemed to be recovering and then she went into a decline.
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(Definition of decline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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