An onomatopoeic word representing a small, dry clicking or clacking sound (as in heels or wooden objects striking a floor): 'katsu-katsu (to click/clack)'.
廊下でハイヒールがかつかつと音を立てて歩いてきた。
High heels clicked down the corridor with a katsu-katsu sound.
古い木の橋が人が渡るたびにかつかつと軋んだ。
The old wooden bridge creaked and clacked katsu-katsu every time someone crossed it.
彼女はかつかつと床を踏みながら笑った。
She laughed while clicking her way across the floor (katsu-katsu).