ばさっと

adverb

with a flap; with a snap; with a thud; with a crash; with a swish; with a rustle

Mimetic adverb describing a sudden, somewhat heavy or forceful movement or sound, such as a flap, snap, thud, crash, swish, or rustle. The exact nuance depends on the context.

• 鳥とりがばさっと羽はばたいて飛とび立たった。

  The bird flapped its wings and took off with a flap.

• 彼かれは本ほんをばさっと閉とじた。

  He snapped the book shut.