蝴蝶刀 [－－－]

Jyutping wu4 dip6 dou1
Pinyin hú dié dāo

Definitions (CC-CANTO)
  1. balisong; butterfly knife; fan knife
Definitions (粵典–words.hk)
  1. 名詞
    一種​刀​，​特點​係​刀柄​分成​兩邊​，​可以​反轉合​埋​收藏​刀身
    butterfly knife; balisong
Definitions (Wiktionary)
  1. noun
    butterfly knife