flute mouthpiece; blowhole
Refers to the opening on a flute or similar wind instrument where the player blows. Also used for the blowhole of a shakuhachi or other Japanese flutes.
尺八の歌口に唇を当てて音を出す。
You place your lips against the shakuhachi's mouthpiece to produce sound.
poetic style; manner of singing
Describes the style or manner in which a poem or song is composed or performed. Often used in classical or literary contexts.
この歌人の歌口は、王朝風の優雅さがある。
This poet's style has the elegance of the Heian period.
Compound of 歌 (uta, 'song') and 口 (kuchi, 'mouth'). The mouthpiece sense is a straightforward extension of 'mouth' to the part of an instrument that is blown into. The poetic style sense likely derives from the idea of the 'mouth' through which a song emerges.