noun
a person who talks too much, especially indiscreetly
verb
to talk too much, especially indiscreetly
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The witness refused to blab about what he saw at the crime scene.
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Don't blab about the surprise party, it's supposed to be a secret!
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I can't believe she blabbed to the teacher about our plans to skip class.
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The river seemed to blab its secrets as it flowed through the forest.