big mouth

US /ˈbɪɡ ˌmaʊθ/
UK /ˈbɪɡ ˌmaʊθ/
"big mouth" picture
1.

大嘴巴, 多嘴的人

a person who talks too much, especially about things that should be kept secret

:
Don't tell him your secret; he's a real big mouth.
别告诉他你的秘密;他是个真正的大嘴巴
Her brother is such a big mouth, he always spills the beans.
她哥哥真是个大嘴巴,总是泄露秘密。