finer than frog hair

English

Adjective

finer than frog hair

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...