a loose tongue

• 藏不住话的嘴；多话的嘴；快嘴

a loose tongue的用法和样例：

例句

1. He is a man who is easy to spill his mind.
   他是一个心里藏不住话的人。
2. He is well known for his quick tongue, and always says sharp things.
   他是出了名的快嘴，说起话来特别扎耳朵。
3. Because the only things rap required were quick wits and an equally quick tongue, it caught on with young African-Americans who could not afford music lessons or instruments.
   由于唱饶舌乐仅需要反应迅捷和巧舌快嘴，因此没有钱上音乐课和买乐器的非裔美籍年轻人开始流行起这种音乐。