Harakiri is an old Japanese way of killing yourself by cutting open your own stomach. Samurai did this when they had lost honour, or when they were ordered to die rather than live in shame. In Japanese the more formal word is seppuku; harakiri, also written hara-kiri, is the blunter everyday name, and English borrowed that blunter one. Though actually, English speakers sometimes stretch it: they say a company committed harakiri when it destroyed itself by a stupid choice. That is figurative and a bit casual. The real act was ritual, grave, and historical. It is not a current punishment, and it is not a general word for any suicide. Treat the real meaning with care; the joke use can sound ugly if a person, not a company, is in the room.

切腹（日本舊時為保名譽而剖腹自殺；日文較口語的說法是腹切，英語借的是這個）