The antonyms for the phrase "spreads on" are quite varied, but they all involve some form of limiting, stopping, or controlling the growth or spread of something. Some of the most common antonyms include words like "confining," "restricting," "containing," or "constricting," which all signify a type of control or limitation over the way something is able to expand or grow. Other possible antonyms might include words like "isolating," "separating," "breaking up," or "disintegrating," which all suggest that something is being pulled apart or prevented from continuing to exist in its current form. Ultimately, the antonyms for "spreads on" all point towards some kind of end or limitation to the process of growth or expansion.