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English definition of “regress”

regress

verb [I] uk   /rɪˈɡres/ formal us  
to return to a previous and less advanced or worse state, condition, or way of behaving: She suffered brain damage from the car accident and regressed to the mental age of a five-year-old. Deteriorating and making worse
regression
noun [U] uk   /-ˈɡreʃ.ən/ us  
(Definition of regress from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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