retrogress
/ˌretrəʊˈgres/verb
no obj.
- go back to an earlier state, typically a worse one倒退, 退化, 衰退, 恶化：
she retrogressed to the starting point of her rehabilitation.
她的病情倒退到恢复初期时的状况。
词源
early 19th cent.: from RETRO- 'back', on the pattern of the verb progress.