Answer: hyperventilate

AnswerCrossword Clue
HYPERVENTILATEExperience a lack of oxygen, perhaps
HYPERVENTILATEShow stress
hyperventilateto breathe rapidly and deeply
hyperventilateInflated or pretentious in style; overblown
hyperventilateBreathe at an abnormally rapid rate, so increasing the rate of loss of carbon dioxide
hyperventilateCause to breathe in such a way