かさこそ

adverb, adverb taking the 'to' particle

rustlingly; with a light rustling sound

Describes a soft, dry rustling sound, like leaves, paper, or fabric rubbing together. Often used with と.

• 落おち葉ばが風かぜでかさこそと音おとを立たてた。

  The fallen leaves rustled in the wind.

• 彼かの女じょは紙かみ袋ぶくろをかさこそさせながらお菓か子しを取とり出だした。

  She rustled the paper bag as she took out the snacks.