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Related to wear thin: worn thin
1. Be weakened or diminished gradually, as in My patience is wearing thin. [Late 1800s]
2. Become less convincing, acceptable, or popular, as in His excuses are wearing thin. [First half of 1990s] Both usages transfer the thinning of a physical object, such as cloth, to nonmaterial characteristics.
wear ˈthinbegin to become less; become less interesting or amusing: My patience is beginning to wear very thin. ♢ Don’t you think that joke’s wearing a bit thin? (= we have heard it many times before)
1. To be weakened or eroded gradually: Her patience is wearing thin.
2. To become less convincing, acceptable, or popular, as through repeated use: excuses that are wearing thin.