can talk under water
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could talk under water
Is always very talkative. Primarily heard in Australia. Good luck getting a word in if you invite Carrie—that girl could talk under water!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
can talk under watermainly AUSTRALIAN
If you say that someone can talk under water, you mean that they talk a lot. My friends tell me that I can talk under water. What they didn't know was that she can also talk under water with a mouth full of marbles.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012