regress

1. To move backwards to an earlier stage; to devolve. (intransitive)
2. To re-develop behavior one had previously grown out of, particularly a behavior left behind in childhood. (intransitive) · Your nightmares stopped when you were eight years old, but after the house burned down, you regressed.
3. To move in the retrograde direction. (intransitive)
4. To reduce in severity or size (as of a tumor), without reaching total remission. (intransitive)
5. To perform a regression on an explanatory variable. (transitive) · When we regress Y on X, we use the values of variable X to predict those of Y.
6. To interrogate a person in a state of trance about forgotten elements of their past. (transitive)

He/she/it regresses · Past regressed · Past participle regressed · -ing form regressing