(informal) Adevice ormachine that is useless because it does not work properly or has failed to work, such as abomb, or explosive projectile.
2021 December 29, Drachinifel, 21:03 from the start, inThe USN Pacific Submarine Campaign - The Dark Year (Dec'41 - Dec'42)[1], archived fromthe original on19 July 2022:
The only amusing highlight wasGudgeon having managed to exploit U.S. codebreaking efforts to ambush and destroy the submarineI-173, albeit not for the lack of the Mark 14's trying to sabotage the effort, as the torpedo that hadhit the sub had refused to detonate; it seemed, however, that the car-crash levels of kinetic energy involved in thedud simplyramming the sub had nonetheless done enough to fatally damage it.
2024 February 1, Joshua P. Cohen, “Innovation - Healthcare”, inForbes[2]:
Alzheimer's Drug Aduhelm Went From Being Hailed A 'Game Changer' To A Dud
At the end of the day, the vast majority of primary schools are vibrant, friendly places and you may struggle to choose one because they all seem so great. Primary schools tend to have the feelgood factor. If you just aren't feeling it, this one's probably adud.
