The phrase "blowing one's top" is an idiom that means to become extremely angry or lose one's temper. Some antonyms for this phrase would be to remain calm, cool, collected, and composed in a situation that may normally trigger anger or frustration. Other antonyms include being patient, tolerant, understanding, and forgiving. Choosing to communicate effectively and avoid shouting or yelling can also be considered an antonym to "blowing one's top." Ultimately, the opposite of "blowing one's top" is to maintain emotional stability, rationality, and self-control, even in the face of provocation or adversity.