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" 同義詞:turkey, bomb,
failing to detonate; especially not charged with an active explosive; "he stepped on a dud mine"
百科解釋
A dud is an ammunition round or explosive that fails to fire or detonate, respectively, on time or on command. Poorly designed devices (for example, improvised explosive devices (IEDs)), and small devices, have higher chances of being duds.