Antonyms for the phrase "quiets down" include "ramp up," "intensify," "accelerate," "enliven" and "galvanize." Instead of calming things down, these words connote a state of increased activity, noise, or chaos. The opposite of "quiets down" can also refer to stimulating the energy level, mood, or atmosphere of a particular situation. For instance, instead of hushing down a party, you could turn up the music, get people dancing, and create a more festive vibe. In conclusion, there are several antonyms for "quiets down," all of which suggest a dynamic, engaging, and vibrant environment.