His speech was full of well-worn phrases that made the audience yawn.

well-worn 是由 well（很好地）和 worn（wear 的过去分词，表示"磨损的"）组成的复合形容词。字面意思是"被磨损得很厉害的"，引申为"用得太多的、陈腐的"。 well-worn phrases 指那些被过度使用、失去新鲜感的表达方式，即"陈词滥调"。