There are numerous synonyms for the phrase "expel air." Some of the most common ones include "exhale," "breathe out," "blow out," "emission," "venting," "puffing," and "exsufflation." "Exhale" and "breathe out" both refer to the act of exhaling air from the lungs. "Blow out" denotes a forceful exhalation, while "emission" and "venting" are more broad terms that cover any release of air or gas from the body. "Puffing" and "exsufflation" are less common synonyms, but they both refer to a gentle, controlled exhale. No matter what you call it, expelling air from the lungs is a vital process for the body to maintain balanced oxygen and carbon dioxide levels.