The phrase "wearing outs" refers to the process of something becoming worn out over time, losing its original quality or effectiveness. There are several synonyms for this phrase, including "deteriorating," "degrading," "breaking down," "disintegrating," "fading," "weakening," "eroding," "corroding," "fraying," and "withering." Each of these words captures a different aspect of the process of wear and tear, from physical damage to gradual decline in function. By using synonyms, writers can add variety and precision to their language, making their descriptions more vivid and engaging for readers.