Blowoffs refer to a sudden release of steam or pressure, but their antonyms can vary depending on the context. In terms of emotions, calmness or composure would be the opposite of a blowoff. It can also refer to an event or activity that did not go as planned, and its antonym would be a success or triumph. In the context of smoking, inhaling or puffing can be opposite to a blowoff. Additionally, it can mean cutting off communication or ignoring someone, and its antonyms would be acknowledging or engaging in conversation. Overall, the antonyms for blowoffs can vary depending on the specific meaning and context.