Blab verb - To relate sometimes questionable or secret information of a personal nature.
Usage example: he blabs a lot, so never share a secret with him
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Synonyms for Blab
Divulge verb - To make known (as information previously kept secret).
Usage example: we tried to make him divulge the name of the winner, but he wouldn't budge
Blab is a synonym for divulge in show topic. You can use "Blab" instead a verb "Divulge", if it concerns topics such as confess.
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Google Ngram Viewer shows how "blab" and "divulge" have occurred on timeline