"Become milder" is an expression used to describe the process of something becoming less severe or intense. There are several synonyms for this phrase, including "soften," "moderate," "temper," "relax," "lighten," and "ease." These words can be used to describe a variety of situations, from the weather becoming less harsh to someone's personality becoming more understanding. "Softening" can describe someone's attitude, "moderating" could describe reducing the intensity of a reaction, while "tempering" could describe reducing the harshness of a decision. "Relaxing" can take on a physical or mental meaning, and "lightening" could describe a weight or emotional burden being lifted. "Easing" can describe something becoming less difficult or less severe.