VERB
倒退;退步;退化
When people or things regress, they return to an earlier and less advanced stage of development.
例句
...if your child regresses to babyish behaviour...
如果你的孩子退行到婴儿状态
Such countries are not 'developing' at all, but regressing.
这些国家根本不是在“发展中”，而是在倒退。