dokan
A single, massive impact or explosion — fireworks going off, a car crash, or something heavy falling. Sudden and startling.
💡A firework exploding — 'The firework went off with a dokan!'
花火がどかんと打ち上がった。
The firework launched with a dokan.
Suddenly there was a ___ and the whole building shook.
突然○○と音がして、建物全体が揺れた。