Definition of thunderflash in English:
A noisy but harmless pyrotechnic device used especially in military exercises.
- We managed to scare the bear away using 30 mm rubber bullets and thunderflashes - a kind of pyrotechnic or firework.
- Or all three so we had to back it up with firing off a thunderflash from a hand pistol.
- By 1 pm at the latest, the MPs were dead and though a British army Chinook, dropping thunderflashes and possibly firing, had arrived, it was too late.