一いちの糸いと

noun

first string (of a shamisen, etc.)

Refers specifically to the thinnest, highest-pitched string on a shamisen or similar traditional Japanese instrument. The term is used in musical contexts.

• 三味線しゃみせんの一いちの糸いとが切きれたので、新あたらしいものと交こう換かんした。

  The first string of the shamisen broke, so I replaced it with a new one.