The phrase "become worn out" refers to the gradual deterioration of an object or material due to prolonged usage. There are various synonyms for this phrase, including "degraded," "frayed," "tattered," "threadbare," "shabby," "ragged," "weathered," "worn," "fatigued," and "used up." These words can be employed interchangeably to describe various conditions of wear and tear. They can also be used to describe human exhaustion and fatigue. When an object or individual becomes worn out, it loses its effectiveness and its ability to function. By using these synonyms, you can convey a more vivid and nuanced description of the extent of the damage or exhaustion being experienced.