blabber - definition and synonyms

verb [intransitive] informal 

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/ˈblæbə(r)/
present tense
I/you/we/theyblabber
he/she/itblabbers
present participleblabbering
past tenseblabbered
past participleblabbered
  1. to talk too much, especially about things that should be kept secret, in a way that annoys other people