breathing
US /ˈbriː.ðɪŋ/
UK /ˈbriː.ðɪŋ/

1.
the process of taking air into and expelling it from the lungs
:
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Her breathing became shallow and rapid.
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Deep breathing exercises can help reduce stress.
1.
the action of taking air into and expelling it from the lungs
:
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He was breathing heavily after the run.
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The doctor checked her breathing.