口こう外がい

noun, noun or participle which takes 'suru', transitive verb

disclosure; revealing; telling

Used for revealing information or secrets, often with a nuance of something that should not be told. Common in negative or prohibitive expressions like 口外しない.

• この秘ひ密みつは絶ぜっ対たいに口こう外がいしないでください。

  Please never reveal this secret.

• 彼かれは会かい社しゃの機き密みつ情じょう報ほうを口こう外がいした。

  He disclosed the company's confidential information.