The difference between Loose lip and Loquaciousness
When used as nouns, loose lip means the practice or characteristic of being overly talkative, especially with respect to inadvertently revealing information which is private or confidential, whereas loquaciousness means the state or property of being loquacious.
check bellow for the other definitions of Loose lip and Loquaciousness
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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.
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Loquaciousness as a noun:
The state or property of being loquacious.