noun
a person who talks too much or indiscreetly
adjective
describing someone who talks a lot or speaks loudly or indiscreetly
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She is often criticized for having a big mouth and speaking without thinking.
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My friend is such a big mouth, she can never keep a secret.
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Don't listen to him, he's just a big mouth trying to impress everyone.
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His big mouth got him into trouble once again, he just can't help himself.