noun
opening a decorative ball filled with confetti, streamers, etc. at a celebration
Refers to the act of breaking open a くす玉 (a hanging ornamental ball) to release confetti, streamers, or a banner, typically at parties, ceremonies, or store openings.
See also: くす玉
パーティーの最後に、みんなでくす玉割りをした。
At the end of the party, everyone did the kusudama-wari (opening of the decorative ball).
新店舗のオープニングセレモニーで、くす玉割りが行われた。
A kusudama-wari was performed at the opening ceremony of the new store.