どさり

adverb taking the 'to' particle

with a thud

Mimetic word describing a heavy, dull sound when something solid lands or falls, often with a sense of weight.

• 大おおきな荷に物もつがどさりと床ゆかに落おちた。

  The large package fell to the floor with a thud.

• 彼かれは疲つかれてどさりとソファに座すわった。

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