The antonyms for the phrase "cuts down size" are "enlarges" and "expands." When you enlarge something, you make it larger or increase its size. This can be done by adding more material, stretching it, or increasing the amount of space it takes up. On the other hand, when you expand something, you make it bigger or more extensive. This can be done by increasing the scope or adding extra elements to it. While cutting down size might be necessary in certain situations, such as reducing waste or streamlining processes, enlarging or expanding can be beneficial when trying to improve productivity, grow a business, or enhance a product.