big mouth
US /ˈbɪɡ ˌmaʊθ/
UK /ˈbɪɡ ˌmaʊθ/
1.
a person who talks too much, especially about things that should be kept secret
:
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Don't tell him your secret; he's a real big mouth.
•
Her brother is such a big mouth, he always spills the beans.
a person who talks too much, especially about things that should be kept secret