Noun
(medicine) Long-term breathing through the mouth, often caused by an obstruction to breathing through the nose.
Used other than figuratively or idiomatically: breathing through the mouth.
Source: en.wiktionary.orgSnoring can be caused by a number of things, including the sleep position, alcohol, medication, anatomical structure of the mouth and throat, stage of sleep, and mouth breathing. Source: Internet
Holding your breath, rapid breathing, shallow breathing, mouth breathing. Source: Internet