口笛: mouth whistle, mouth whistling

合口, 合い口: compatibility, rapport, or cooperativeness in anything done together with others / 合口, 合い口: getting along well with others, affinity

matchlock gunpowder

(BDSM) gag

butting in to others' affairs

to butt in to others' affairs

口溶け: melt in the mouth

the mouth (as a general area on the face); the lips

(history, government) a 律令 (ritsuryō) department under the 中務省 (Nakatsukasashō, “Ministry of the Center”), responsible for managing books and stationery used by officials

dead end, road closure, cul-de-sac