懐剣

(historical) a kind of dagger used by the samurai class, carried in the 懐 (futokoro, “chest area of a kimono above the 帯 (obi, “sash”) and inside the collar”) for self-defense

(modern) a replica dagger as part of certain ceremonial costume, such as the formal wear of boys for the 七五三 (shichi-go-san, “seven-five-three”) festival

(poetry) working on possible response lines for a 連歌 (renga, “linked poem”), 俳諧 (haikai, “amusing style of waka Japanese poetry”), or similar call and response style of performed poetry, prior to a performance; any lines prepared before such a performance