dud

名词 dud:

1. someone who is unsuccessful
   同义词：flop, washout
2. an explosion that fails to occur
   同义词：misfire
3. an event that fails badly or is totally ineffectual
   同义词：turkey, bomb

形容词 dud:

1. failing to detonate; especially not charged with an active explosive

1. This battery is a dud.
   这电池是废的。
2. Two of the fireworks in the box were duds.
   盒子里的烟火有两个是坏的。
3. The new manager is a complete dud.
   新经理完全是个废物。

dud

n.（名词）
A bomb, shell, or explosive round that fails to detonate.
哑弹：未爆炸的炸弹，炮弹或整发子弹
Informal One that is disappointingly ineffective or unsuccessful.
【非正式用语】 无用的人或物的：令人失望的无用的或不成功的人或物
duds Informal
duds 【非正式用语】
Clothing.
衣服
Personal belongings.
个人所有物

来源：
Middle English dudde [a cloak]
中古英语 dudde [斗篷]