dobon
The heavy splash of a large object falling into water. Deeper and more dramatic than 'pochan'.
💡A rock thrown into a pond — 'It hit the water with a dobon.'
石が池にどぼんと落ちた。
The rock fell dobon into the pond.
The ball fell ___ into the river and sank.
ボールが川に○○と落ちて沈んだ。