dud /ˈdʌd/
 衣服,啞彈,無用物(a.)無用的


 dud
      adj : failing to detonate; especially not charged with an active
            explosive; "he stepped on a dud mine"
      n 1: someone who is unsuccessful [syn: flop, washout]
      2: an explosion that fails to occur [syn: misfire]
      3: an event that fails badly or is totally ineffectual; "the
         first experiment was a real turkey"; "the meeting was a
         dud as far as new business was concerned" [syn: turkey,
         bomb]