"respire" in the verb sense
breathe easily again, as after exertion or anxiety
undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide
3. breathe, take a breath, respire, suspire
draw air into, and expel out of, the lungs
"I can breathe better when the air is clean"
"The patient is respiring"
Source: WordNet® (An amazing lexical database of English)
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