How to Say "Butterfly Knife" in Japanese

バタフライナイフ

batafurai naifu

The Japanese term for "butterfly knife" is バタフライナイフ (batafurai naifu).

This noun refers to a folding pocket knife.

Meaning: folding pocket knife (noun)

How do you pronounce it?

The romanization is batafurai naifu.

In Japan, the term バタフライナイフ is often associated with illegal possession because such knives are strictly regulated under the Swords and Firearms Control Law. Carrying one in public can lead to immediate arrest, regardless of whether it is opened.
In Japanese pop culture, the バタフライナイフ is frequently used by cinematic villains to signal a character's lethal skill or foreign background, as the knife is not native to Japanese history.
While バタフライナイフ is a direct loan, the Japanese language uses the term 折りたたみ for 'folding' in everything from umbrellas to chairs, not just knives.

バタフライナイフは、独特な形状で人々を魅了します。
Butterfly knives captivate people with their unique shape.
カッコいい刃物を探していて、バタフライみたいなナイフを見つけたんだ。
I was looking for a cool knife and found one like a butterfly knife.
彼はバタフライナイフをコレクションしている。
Kare wa batafurai naifu o korekushon shite iru.
He collects butterfly knives.
そのバタフライナイフはとてもかっこいい。
Sono batafurai naifu wa totemo kakkoii.
That butterfly knife is very cool.
バタフライナイフの扱いには注意してください。
Batafurai naifu no atsukai ni wa chuui shite kudasai.
Please be careful when handling a butterfly knife.

Kenta shows a new item to Yui in a living room.

健太 Kenta

見て、新しいバタフライナイフを買ったんだ。
Mite, atarashii batafurai naifu o katta n da.
Look, I bought a new butterfly knife.
結衣 Yui

わあ、すごく派手なバタフライナイフだね！
Waa, sugoku hade na batafurai naifu da ne!
Wow, it's a very flashy butterfly knife!
健太 Kenta

これ、動かすのがすごく難しいんだ。
Kore, ugokasu no ga sugoku muzukashii n da.
It is very difficult to manipulate this.
結衣 Yui

健太、危ないから気を付けてね。
Kenta, abunai kara ki o tsukete ne.
Kenta, be careful because it's dangerous.

Sources

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