Mouth-to-mouth is a rescue method in which you attempt to resuscitate someone by breathing into his mouth and filling his lungs with your breath.
An example of mouth-to-mouth is when someone was drowning and pulled out of the pool and you try to get him to start breathing again by breathing into his mouth and filling his lungs.
designating a method of resuscitation in which the rescuer breathes directly into the mouth and lungs of a person who has stopped breathing
- mouth-to-mouth resuscitation
- (slang) Kissing, particularly French kissing.