内ない緒しょ事ごと

noun

secret; private matter; confidential matter

Refers to something kept secret or private, often among a small group. Commonly used in phrases like 内緒事にする (to keep something secret).

• これは二人ふたりだけの内ない緒しょ事ごとだよ。

  This is a secret just between the two of us.

• 会かい社しゃの内ない緒しょ事ごとを外がい部ぶに漏もらしてはいけない。

  You must not leak the company's confidential matters to outsiders.