regressed
verb (past tense)UK /rɪˈɡrest/
US /rɪˈɡrest/
Went back to how you were before, instead of getting better.
After the long break, his reading skills regressed a little.
RELATED WORDS
OTHER MEANINGS
2. Returned to an earlier, less developed state or form.
The child regressed to baby talk when the new baby arrived.
3. In statistics, described a relationship where one thing changes in a predictable way with another.
The scientists regressed height against age to find the pattern.
4. Moved backward physically or in time.
The glacier regressed up the valley as the climate warmed.