Third person singular or plural of blab; tells secrets or talks excessively.
From Middle English 'blabren,' an imitative word meaning to talk foolishly or reveal secrets. The '-s' marks modern present tense.
To 'blab' originally meant to make foolish noises, but over time it specifically came to mean revealing secrets—showing how context can shift a word's meaning from general silliness to moral accusation.
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