The phrase "mows down" typically refers to the act of cutting down or destroying something completely. Some antonyms for this phrase include "spares," "preserves," "protects," and "conserves." These words imply that instead of destroying or eliminating, there is a need to save or maintain something. For example, instead of mowing down a forest, one could choose to preserve it for future generations. Similarly, instead of mowing down an entire building, one could choose to conserve and protect its historic features. Using antonyms for "mows down" can help promote a more sustainable and conscientious approach to the environment and resources.