The difference between Big mouth and Loose lip
When used as nouns, big mouth means the mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information, whereas loose lip means the practice or characteristic of being overly talkative, especially with respect to inadvertently revealing information which is private or confidential.
check bellow for the other definitions of Big mouth and Loose lip
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Big mouth as a noun (idiomatic):
the mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information
Examples:
"Shut your big mouth or I'll shut it for you."
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Big mouth as a noun (idiomatic):
a person who talks too much, especially by making exaggerated claims or by inappropriately revealing information
Examples:
"Shut up, big mouth!"
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Loose lip as a noun (idiomatic, often [[pluralize]]d):
The practice or characteristic of being overly talkative, especially with respect to inadvertently revealing information which is private or confidential.