Definition of regress verb from the Oxford Advanced Learner's Dictionary

 

regress

 verb
verb
BrE BrE//rɪˈɡres//
 
; NAmE NAmE//rɪˈɡres//
 
Verb Forms present simple I / you / we / they regress
BrE BrE//rɪˈɡres//
 
; NAmE NAmE//rɪˈɡres//
 
he / she / it regresses
BrE BrE//rɪˈɡresɪz//
 
; NAmE NAmE//rɪˈɡresɪz//
 
past simple regressed
BrE BrE//rɪˈɡrest//
 
; NAmE NAmE//rɪˈɡrest//
 
past participle regressed
BrE BrE//rɪˈɡrest//
 
; NAmE NAmE//rɪˈɡrest//
 
-ing form regressing
BrE BrE//rɪˈɡresɪŋ//
 
; NAmE NAmE//rɪˈɡresɪŋ//
 
 
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[intransitive] regress (to something) (formal, usually disapproving) to return to an earlier or less advanced form or way of behaving Word Origin late Middle English (as a noun): from Latin regressus, from regredi ‘go back, return’, from re- ‘back’ + gradi ‘walk’.
See the Oxford Advanced American Dictionary entry: regress