adverb taking the 'to' particle, adverb
with a thud; with a heavy thump
Mimetic word describing the sound or sensation of a heavy object falling or landing solidly. Often used with と.
See also: どしん
大きな石がどしりと地面に落ちた。
A large rock fell to the ground with a thud.
彼はどしりとソファに座った。
He sat down heavily on the sofa with a thump.