Blabbermouth Definition

blăbər-mouth
blabbermouths
noun
blabbermouths
One who talks indiscreetly or incessantly.
American Heritage
A person who blabs.
Webster's New World
If it weren't for that blabbermouth Sally, the principal would never have known we did it.
Wiktionary

Other Word Forms of Blabbermouth

Noun

Singular:
blabbermouth
Plural:
blabbermouths

Origin of Blabbermouth

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blabbermouth