the process of taking air into and expelling it from the lungs

his breathing was shallow

a sign in Greek (῾ or ᾿) indicating the presence of an aspirate (rough breathing) or the absence of an aspirate (smooth breathing) at the beginning of a word

take air into the lungs and then expel it, especially as a regular physiological process

she was breathing deeply

breathe in through your nose

he breathed out heavily

we are polluting the air we breathe