Blowing sky-high is a phrase that typically describes something exploding or being destroyed. Its antonyms, on the other hand, might include phrases such as keeping everything intact, keeping things grounded, or keeping things stable. These antonyms imply a sense of safety and security, in contrast to the reckless and explosive nature of blowing sky-high. Other antonyms include holding back, restraining, and being cautious, all of which suggest a sense of control and moderation. Ultimately, the antonyms of blowing sky-high are words and phrases that emphasize stability, safety, and control, opposing the destructive and uncontrollable forces that blowing sky-high represents.