1. Take air into the lungs and then expel it, esp. as a regular physiological process: “she was wheezing as she breathed”. (Google Dictionary)
2. Be or seem to be alive because of this: “at least I’m still breathing”. (Google Dictionary)
Syn: respire, inhale
Word Origin: From Middle English brethen (“to breathe, blow, exhale, odour”), from breth (“breath”). More at breath.