一いっ糸し一いち毫ごう

noun

tiny amount; the slightest bit

Emphatic expression for an extremely small quantity, often used in negative or conditional contexts to mean 'not even a tiny bit'.

• 彼かれの話はなしには一いっ糸し一いち毫ごうの真しん実じつもない。

  There is not a shred of truth in his story.

• 一いっ糸し一いち毫ごうたりとも無む駄だにできない。

  We cannot waste even the slightest bit.