Definition of breathe out phrasal verb from the Oxford Advanced Learner's Dictionary

  

breathe out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
 to send air out of your lungs through your nose or mouth synonym exhale Take a deep breath and then breathe out when I tell you.
to send air, smoke, etc. out of your lungs through your nose or mouth Humans take in oxygen and breathe out carbon dioxide.
See the Oxford Advanced American Dictionary entry: breathe out