秘ひ密みつ会かい議ぎ

noun

secret meeting; secret conference

A meeting or conference held in secret, not open to the public or unauthorized persons.

• 彼かれらは秘ひ密みつ会かい議ぎを開ひらいて、次つぎの計けい画かくを話はなし合あった。

  They held a secret meeting to discuss the next plan.