[wear thin] {v.}
1. To become thin from use, wearing, or the passing of time.
* /My old pair of pants has worn thin at the knees./* /This old dime has worn very thin./
2. To grow less, or less interesting; decrease.
* /The joke began to wear thin when you heard it too many times./* /The teacher's patience began to wear thin when he saw that no one knew the lesson./
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