adverb taking the 'to' particle
with a thud; with a flump; with a crash; heavily
Mimetic adverb describing a heavy object or person falling or landing with a dull, heavy sound. Often used with と (どたりと).
大きな荷物がどたりと床に落ちた。
The large luggage fell to the floor with a thud.
彼は疲れてどたりとソファに倒れ込んだ。
Exhausted, he flopped heavily onto the sofa.
Onomatopoeic formation from the sound of a heavy object falling or landing with a dull impact.