thread·bare /ˈθrɛdˌbær, ˌbɛr/
  (a.)毛絨已磨掉而露線的
  Thread·bare a.
  1. Worn to the naked thread; having the nap worn off; threadbare clothes. “A threadbare cope.”
  2. Fig.: Worn out; as, a threadbare subject; stale topics and threadbare quotations.
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  threadbare
       adj 1: repeated too often; overfamiliar through overuse; "bromidic
              sermons"; "his remarks were trite and commonplace";
              "hackneyed phrases"; "a stock answer"; "repeating
              threadbare jokes"; "parroting some timeworn axiom";
              "the trite metaphor `hard as nails'" [syn: banal, commonplace,
               hackneyed, old-hat, shopworn, stock(a), timeworn,
               tired, trite, well-worn]
       2: having the nap worn away so that the threads show through;
          "threadbare rugs"