to send air out of your lungs through your nose or mouth; to send air, smoke, etc. out of your lungs through your nose or mouth
to send air out of your lungs through your nose or mouth
breathe sth out
to send air, smoke, etc. out of your lungs through your nose or mouth
Humans take in oxygen and breathe out carbon dioxide.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición