Meaning of “regress” in the English Dictionary

(Definition of “regress” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"regress" in American English

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regressverb [ I ]

us /rɪˈɡres/

to return to a previous and less advanced or worse state:

Our team improved in the second half, while our opponents regressed.
regression
noun [ U ] us /rɪˈɡreʃ·ən/

Learning a language requires regression to childlike simplicity.

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