The phrase "bounces off" implies rebounding or rejecting, so its antonyms would include "adheres to" or "sticks to" for the implication of attachment or adherence. An antonym could also be "absorbs" which implies that the force or impact is absorbed by the object instead of bouncing off. Alternatively, "penetrates" or "enters" can be antonyms, as they express the opposite motion of something bouncing off a surface. Hence, if we use antonyms for "bounces off," we can indicate a wide range of actions such as attaching, absorbing, penetrating, or entering, each with its own specific set of contexts and implications.