水母くらげの骨ほね

expression

something extremely rare; something unexpected to exist

Idiomatic expression literally meaning 'jellyfish bones'; used to describe something so rare or unlikely that it is almost unimaginable. Rare term.

• 彼かれが遅ち刻こくするなんて、まるでくらげの骨ほねだ。

  Him being late is like finding jellyfish bones — something you'd never expect.

• そんな都つ合ごうのいい話はなしはくらげの骨ほねのようなものだ。

  A story that convenient is like jellyfish bones — exceedingly rare.