To breathe, or to have difficulty breathing - synonyms or related words
to take air into your lungs through your nose or mouth and let it out again
to push out air from your mouth
if you choke, or if something chokes you, you cannot breathe because there is not enough air or because something is blocking your throat
mainly literary to breathe in suddenly, for example because you are surprised, shocked, or in pain
to breathe or blow out air noisily, especially because you have been running, climbing, etc.