The word "breathe into" signifies inhaling or taking in air. Its antonyms, on the other hand, refer to exhaling or expelling breath. Some possible antonyms for "breathe into" are "exhale," "expire," "puff out," "blow out," and "storm out." These words connote the act of releasing air from the lungs or from a thing. They are opposite in meaning to "breathe into," which conveys filling up with air or inhaling deeply. Other antonyms for "breathe into" might include phrases like "let out a breath," "breathe out," or "let the air out," all of which describe the process of exhaling.