どっかり

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

plunk down heavily; flump down

Describes the action or sound of something heavy being placed or sitting down with a thud. Often used with と and verbs like 置く, 座る.

• 彼かれは疲つかれてソファにどっかりと座すわった。

  Exhausted, he flopped down onto the sofa.

• 大おおきな荷に物