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regress

verb [I]
 
 
/rɪˈɡres/ formal

Definition

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. → Compare progress nounDeteriorating and making worse regression
 
 
/-ˈɡreʃ.ən/ noun [U]
(Definition of regress verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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