expression, godan verb (-su)
betray a secret; reveal a secret
Used when someone intentionally or accidentally lets a secret slip out. Often implies a breach of trust.
See also: 秘密を暴露する
彼はうっかり秘密を漏らしてしまった。
He carelessly let the secret slip out.
誰にも秘密を漏
I promised not to reveal the secret to anyone.