Mouth-to-mouth resuscitation. / (slang, figuratively) Kissing, particularly French kissing.

A first aid technique to return an unconscious person's respiration by pressing the rescuer's mouth against the mouth of the patient and blowing air into his/her lungs.

plural of mouth-to-mouth resuscitation

(anatomy) The opening of a creature through which food is ingested. / The end of a river out of which water flows into a sea or other large body of water. / An outlet, aperture or orifice.

(transitive) To speak; to utter. / (transitive) To make the actions of speech, without producing sound. / To form with the mouth.

present participle of mouth

The act of forming a shape with the mouth, especially as part of sign language. / Ranting; passionate speech devoid of meaning.

Bombastic or awkward.

The amount that will fit in a mouth. / (slang) Quite a bit. / Something difficult to pronounce or say. / A tirade of abusive language.

plural of mouthful