An onomatopoeic word describing the sound or action of something large (cloth, paper, book) falling or closing with a thud; often used as 'ばさりと'.
彼女はコートをばさりと脱いでソファに投げた。
She tossed off her coat with a swish and threw it onto the sofa.
図書館で本がばさりと閉じて静寂が戻った。
A book closed with a thud in the library, and silence returned.
窓辺のカーテンが風にばさりとなびいた。
The curtains at the window fluttered with a soft thud in the wind.