The antonyms for the phrase "spilling over" are contained, controlled, and limited. Undeniably, the term spilling over means to exceed the limits of containment, which is typically associated with an overflow of something. In contrast, contained is the opposite of spilling over, which implies that everything is kept within the safe limits. Controlled refers to the practice of keeping something within one's reach so that it stays manageable, and limited means something possesses a finite quantity without going beyond its capacity. Therefore, while spilling over often implies a sense of abundance, contained, controlled, and limited reflect elements of restriction, management, and confinement.