The phrase "mow down" typically refers to cutting or knocking down vegetation, people or animals. Its antonyms are words that can be used in its place to convey the opposite meaning. Some of the antonyms for "mow down" include sparing, preserving, saving, and protecting. These words suggest an action of caring for or nurturing rather than destroying or killing. For example, rather than mowing down a patch of wildflowers, one might opt to spare them and cultivate them for future enjoyment. As such, choosing the right antonym for "mow down" can allow you to communicate a more positive, productive message.