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blabbermouth (n.)

also blabber-mouth, 1931, from blabber + mouth (n.).

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Definitions of blabbermouth from WordNet

blabbermouth (n.)
someone who gossips indiscreetly;
Synonyms: tattletale / tattler / taleteller / talebearer / telltale
From wordnet.princeton.edu

Dictionary entries near blabbermouth

biz

bizarre

bize

blab

blabber

blabbermouth

black

black box

black code

black comedy

Black Death