Artificial respiration (4,2,4)
I believe the answer is:
kiss of life
'artificial respiration' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for kiss of life that I've seen before include "Mouth-to-mouth resuscitation" , "first-aid" , "Emergency resuscitation" , "First aid treatment" , "Act of resuscitation" .)