どさっと

adverb

with a thud

Mimetic adverb describing a heavy object falling or being dropped with a dull, heavy sound.

See also: ドサ

• 彼かれは疲つかれて、どさっとソファに座すわった。

  Exhausted, he plopped down onto the sofa with a thud.

• 荷に物もつをどさっと床