blabbermouth
blab·ber·mouth
noun
1.
someone who gossips indiscreetly
Origin
From blabber + mouth.
Related words
Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.