mouth-to-mouth resuscitation

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A technique used to resuscitate a person who has stopped breathing, in which the rescuer presses his or her mouth against the mouth of the victim and, allowing for passive exhalation, forces air into the lungs at intervals of several seconds.

A technique used to resuscitate a person who has stopped breathing, in which the rescuer presses his or her mouth against that of the victim and, allowing for passive exhalation, forces air into the lungs every few seconds. Also called mouth-to-mouth respiration.

The noun has one meaning:

Meaning #1: an emergency procedure consisting of external cardiac massage and artificial respiration; the first treatment for a person who has collapsed and has no pulse and has stopped breathing; attempts to restore circulation of the blood and prevent death or brain damage due to lack of oxygen
  Synonyms: cardiopulmonary resuscitation, CPR, cardiac resuscitation, kiss of life