There are numerous synonyms that can be used in place of the phrase "wear out". The term generally implies a gradual deterioration or exhaustion of something over time. Some common synonyms for this phrase include "use up", "exhaust", "deplete", "consume", "drain", "diminish", "erode", "weaken", "fatigue", and "tire out". Each of these words conveys a similar sense of something being slowly worn down or depleted, whether it be physical objects like clothing or machinery, or more abstract concepts like energy or patience. By using synonyms for "wear out" in your writing, you can avoid redundancy and add variety to your language.