on the mend

from The Collaborative International Dictionary of English v.0.48

Mend \Mend\, v. i.
   To grow better; to advance to a better state; to become
   improved; to recover; to heal. --Shak.
   [1913 Webster +PJC]

   {on the mend} pred. a. recovering from an illness or injury.
      [PJC]