1. (

• regress ,

) 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" ;