regress

1. V-I When people or things regress, they return to an earlier and less advanced stage of development. 退步[正式]

If your child regresses to babyish behaviour, all you know for certain is that the child is under stress. 如果你的孩子退步到幼稚的行为，你可以肯定的是孩子正处在压力之下。

2. regressionN-VAR 退步

Calderdale accepts that this can cause regression in a student's learning process. 考尔德戴尔承认这会在学生的学习过程中引起退步。