1CONDITION/STATE OF somethingclothes, carpets etc that are threadbare are very thin and in bad condition because they have been used a lot 〔衣服、地毯等〕破旧的,磨薄的
a threadbare old sofa
一张破旧的沙发
2.threadbare excuse/argument/joke etcEFFECTIVEan excuse etc that is no longer effective because it has been used too much 陈旧的托词/论点/笑话等