[] a thing that is useless, especially because it does not work correctly or provide any benefit没用的东西；废物◆What we thought was a good investment turned out to be a dud.我们原以为是个好的投资项目，结果证明无利可图。▸dud
adjective
[] ◆a dud cheque (= written by sb who has not enough money in their bank account)空头支票