expression, godan verb (-su)
disclose a secret; reveal a secret
Used when someone intentionally reveals a secret, often one that was previously hidden. Similar to 秘密を暴露する but can be slightly less forceful.
See also: 秘密を暴露する
彼はついに秘密を明かした。
He finally disclosed the secret.
彼女は私にだけ秘
She revealed the secret only to me.