The word "rises crescendo" refers to a gradual increase in volume, intensity, or momentum. Its antonyms or opposites can be words that describe a decrease or decline in these qualities. Some examples of antonyms for "rises crescendo" include "falls decrescendo," "decreases," "dwindles," "tapers off," and "diminishes." These words suggest a reduction in the energy and power of a sound, music, or any other phenomenon. Therefore, by understanding the antonyms, one can improve their vocabulary and communication skills, and become more precise and nuanced in their expressions.