big mouth
noun [ C usually singular ] informal disapproving uk/ˈbɪɡ ˌmaʊθ/ us/ˈbɪɡ ˌmaʊθ/
多嘴的人
If someone is or has a big mouth, they often say things that are meant to be kept secret.
He is/has such a big mouth. 他太多嘴了。
He went and opened his big mouth and told them the whole story. 他去了，并且多嘴多舌地把整件事告诉了他们。
I'm sorry. I wasn't supposed to tell you! Me and my big mouth! 对不起，我不该告诉你们的。我真多嘴！