adverb taking the 'to' particle
Mimetic word describing a heavy, dull sound when something solid lands or falls, often with a sense of weight.
大きな荷物がどさりと床に落ちた。
The large package fell to the floor with a thud.
彼は疲れてどさりとソファに座った。
Exhausted, he plopped down onto the sofa with a thud.
Onomatopoeic formation from the sound of a heavy object falling or landing.