breathing
noun /ˈbriːðɪŋ/
  /ˈbriːðɪŋ/
[uncountable]- the action of taking air into the lungs and sending it out again
- Her breathing became steady and she fell asleep.
 - Deep breathing exercises will help you relax.
 - Heavy (= loud) breathing was all I could hear.
 - Firefighters wearing breathing apparatus went into the house.
 - The drug is used to treat breathing difficulties caused by asthma.
 - Are you having difficulty in breathing?
 
Extra Examples- His breathing was uneven, and he could hardly speak.
 - She picked up the phone and heard sounds of heavy breathing.
 - Try breathing exercises to calm your nerves.
 
Oxford Collocations Dictionaryadjective- deep
 - shallow
 - controlled
 - …
 
- control
 - regulate
 
- quicken
 - slow
 - slow down
 - …
 
- apparatus
 - difficulties
 - problems
 - …