1.have something turn round and round inside one's mouth:
To refrain from saying something that one wants to say or be unable to do it.
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승규는 잘못했다는 말이 입 안에서 뱅뱅 돌고 나오지 않았다.
Seung-gyu didn't say anything wrong.
♔
남자 친구하고 싸웠다면서?
I heard you fought with your boyfriend.
♕
응. 너무 화가 나서 헤어지자는 말이 입 안에서 뱅뱅 도는 걸 겨우 참았어.
Yeah. i was so angry that i managed to hold back the words saying goodbye.
2.
말하고 싶은 이름이나 알맞은 표현이 잘 생각나지 않다.
2.have something turn round and round inside one's mouth:
To be unable to think of a name or an appropriate expression.
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엄마는 치매인지 말이 입 안에서 뱅뱅 돌기만 하고 안 나온다고 걱정을 했다.
Mom was worried that it was dementia, that the horse was just spinning around in her mouth and not coming out.
♔
그 사람 이름이 뭐더라.
What's his name?
♕
뭐지? 나도 입 안에서 뱅뱅 도는데 생각이 안 나네.
What is it? i can't remember either.