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つぶやくHe tends to mumble when he's nervous.
彼は緊張すると、もごもご話す傾向がある。to speak in a low and indistinct manner, often making it difficult to understand what is being said.
Do not mumble your words.
言葉をぼそぼそ言わないでください。She mumbled a quiet apology.
彼女は静かに謝罪の言葉を漏らした。He mumbled, "I don't know."
彼は「知らない」とつぶやいた。mumble a response
返事をぶつぶつ言うmumble incoherently
支離滅裂にぶつぶつ言うmumble under one's breath
小声でぶつぶつ言うstammer
murmur
utter indistinctly
