What does "big mouth" mean?

The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.

What is a synonym for "big mouth"?

Common synonyms include: blower, blowhard, blusterer, boaster, brag, braggadocio.

noun

noun ·Rare ·Advanced level

Noun

1
The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information. derogatory, idiomatic, often
"Shut your big mouth or I'll shut it for you."
2
A person who talks too much, especially by making exaggerated claims or by inappropriately revealing information. derogatory, idiomatic, often
"Shut up, big mouth!"

"Shut your big mouth or I'll shut it for you."