"regressing" in the verb sense
go back to a statistical means
2. revert, return, retrovert, regress, turn back
go back to a previous state
"We reverted to the old rules"
3. regress, retrograde, retrogress
get worse or fall back to a previous condition
4. relapse, lapse, recidivate, regress, retrogress, fall back
go back to bad behavior
"Those who recidivate are often minor criminals"
Source: WordNet® (An amazing lexical database of English)
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