1. go back to bad behavior
e.g. Those who recidivate are often minor criminals
Synonym: relapselapserecidivateregressretrogress
2. retreat
Synonym: losedrop offfall behindrecede
3. move back and away from
e.g. The enemy fell back
4. hang (back) or fall (behind) in movement, progress, development, etc.
Synonym: lagdawdlefall behind
5. fall backwards and down
6. have recourse to
e.g. The government resorted to rationing meat