a.

1. （鐘、表等）發條走完的；（電池）耗盡的
   Standing on the table was a run-down clock.

   桌子上放著一隻走停了的鐘。

2. 精疲力竭的；衰弱的
   We're completely run-down and need a thorough rest.

   我們精疲力盡了，需要徹底休息。

3. 失修的；破敗的；衰敗的
   I bought a run-down farm house and plan to fix it up.

   我買了一間破敗的農舍，打算整修整修。

   We will plan to rehabilitate the run-down neighborhood.

   我們計畫重建這個破落的街區。