Rectify

verb

1. To heal (an organ or part of the body).
2. To restore (someone or something) to its proper condition; to straighten out, to set right.
3. To remedy or fix (an undesirable state of affairs, situation etc.).

   "to rectify the crisis"

4. To purify or refine (a substance) by distillation.
5. To correct or amend (a mistake, defect etc.).