ポトン

adverb taking the 'to' particle

with a plop; with a plonk; with a flop

Mimetic word for a light, soft dropping sound, like a small object falling into water or onto a surface. Often used with と.

See also: ポトリ

• 水すい滴てきがポトンと落おちた。

  A drop of water fell with a plop.

• 本ほんが床ゆかにポトンと落おちた。

  The book fell onto the floor with a flop.