口くち三味線じゃみせん

noun

humming a shamisen tune; vocal imitation of shamisen

Refers to imitating the sound of a shamisen with one's mouth, often in a lively or rhythmic way. Can be used literally or figuratively.

• 彼かれは口くち三味線じゃみせんで祭まつりの曲きょくを真似まねた。

  He imitated a festival tune by humming it like a shamisen.

noun

smooth talk; flattery; cajolery

Figurative use: describing someone's speech as being as smooth and pleasing as a shamisen melody, often with a nuance of insincere or manipulative charm.

• 彼かれの口くち三味線じゃみせんに乗のせられて、つい契けい約やくしてしまった。

  I was taken in by his smooth talk and ended up signing the contract.