Getting better (2,3,4)
I believe the answer is:
on the mend
'getting better' is the definition.
(on the mend means recovering from illness)
This is all the clue.
(Other definitions for on the mend that I've seen before include "Improving in health" , "convalescing" , "Recovering from an injury or illness" , "returning to health" , "undergoing recovery?" .)