The phrase "juicing up" refers to adding energy, excitement or enthusiasm to something. In contrast, antonyms for this phrase include "dulling down", "weakening", "calming", "soothing", "relaxing", and "unexciting". These words convey a sense of reduction in energy, enthusiasm, or activity level. Other antonyms for "juicing up" may include "cooling down", "calming down", "toning down", "quieting", "restraining", "moderating", or "subduing". These alternative phrases suggest a diminishment of intensity or excitement, and are often used when trying to create a more subdued, sedate or calming environment.