Etymology
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blabber (v.)

mid-14c., "to speak as an infant speaks," frequentative of blabben, of echoic origin (compare Old Norse blabbra, Danish blabbre "babble," German plappern "to babble"). Meaning "to talk excessively" is from late 14c. Related: Blabbered; blabbering.

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Definitions of blabber
1
blabber (v.)
speak (about unimportant matters) rapidly and incessantly;
Synonyms: chatter / piffle / palaver / prate / tittle-tattle / twaddle / clack / maunder / prattle / blab / gibber / tattle / gabble
2
blabber (n.)
one who reveals confidential information in return for money;
Synonyms: informer / betrayer / rat / squealer
From wordnet.princeton.edu