finer than frog hair

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finer than frog hair (not comparable)

  1. (simile, colloquial) Extremely fine.
    • 1997 -- Martin Limón: Slicky Boys (page 2) [1]
      Eun-hi was a business girl. One of the finest in Itaewon. Finer than frog hair, to be exact. A GI's dream...