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

(genetics, biochemistry) A receptor-like protein in plants which, when absent, leads to an overproduction of stomata

From the comments of children, who are honest and innocent, . . . (comes truth or wisdom).

(obsolete) Talkative; eager to speak. / With the mouth open. / Gaping in surprise, wonder or astonishment.

Alternative spelling of motormouth

prone to speaking evasively, indirectly, or duplicitously; not forthright

The vocal imitation of instrumental music. / Words (or sometimes actions) that sound good but do not mean anything.

(idiomatic) The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.

(idiomatic) Verbal means of passing on information.