Definition of breathe out phrasal verb from the Oxford Advanced American Dictionary

 

breathe out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

breathe out

 
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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.

breathe somethingout

 
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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 Learner's Dictionary entry: breathe out