Antonyms for the word "scale down" are "inflate," "enlarge," "expand," "boost," and "increase." Whereas scaling down usually refers to reducing the size or amount of something, inflating and enlarging indicate making something bigger. Expanding and boosting mean increasing the scope or reach of something. When we scale down, we try to use fewer resources, reduce expenses or downsize operations. Conversely, using more resources, investing more into operations, or increasing activities would not be scaling down. In conclusion, knowing the antonyms for "scale down" will help us have a better understanding of the different ways we can adjust the size or scope of something in various situations.