シュンッ

adverb taking the 'to' particle

with a whoosh; quickly; instantaneously

Mimetic word describing a swift, smooth movement or action that happens in an instant, often with a light sound or no sound at all.

• 彼かれはシュンッと音おとを立たてて走はしり去さった。

  He dashed away with a whoosh.

• 矢やがシュンッと飛とんでいった。

  The arrow flew off instantly.