Scaling up is the antonym for scaling down, which means expanding or increasing in size or scope. It refers to the process of making something bigger or developing it to a higher level. This term is often used in the business world to describe a company's growth strategy, in which it acquires more resources, hires more employees, and expands its operations. In contrast, scaling down involves reducing the size or scope of something, often to cut costs or streamline operations. Other antonyms for scaling down could include "expanding," "growing," "enlarging," "developing," and "building up." Overall, antonyms for scaling down could encompass any phrase that implies growth or expansion.