bera-bera
Speaking at length without pause, often revealing things that should be kept private. Carries a nuance of being talkative to the point of annoyance.
💡Someone spilling secrets — 'She was blabbing bera-bera about the surprise party!'
彼女は秘密をべらべらしゃべった。
She blabbed bera-bera about the secret.
He ___ told everyone about the confidential plan.
彼は機密の計画を○○みんなに話してしまった。