1. [ noun ] an explosion that fails to occur
Synonyms: misfire
Related terms: breakdown misfire
2. [ noun ] (informal) someone who is unsuccessful
Synonyms: washout flop
Related terms: loser colloquialism
3. [ adjective ] failing to detonate; especially not charged with an active explosive

"he stepped on a dud mine"

Related terms: unloaded
4. [ noun ] an event that fails badly or is totally ineffectual
Synonyms: bomb turkey

"the first experiment was a real turkey" "the meeting was a dud as far as new business was concerned"

Related terms: flop fail
Similar spelling:   dude