The phrase "salt the earth" typically means to devastate or destroy completely, leaving nothing behind. However, some antonyms for this phrase include to cultivate or nurture, to grow and flourish, or to build and construct. These antonyms imply a sense of hope, growth and positivity. For example, instead of salting the earth, one could focus on fertilizing the soil, planting new seeds, and nurturing the growth of new life. This can create a sense of renewal and growth, rather than destruction and devastation. So, while "salt the earth" may be a powerful and dramatic phrase, it's important to remember that there are always positive alternatives to consider.