0 to talk carelessly or too much, often telling others something you should keep secret: --
Someone blabbed to the press.
This ending causes an "a" or "o" in the stem to umlaut to "e": "blebi" from "blab-".
A blab school was basically without books and paper for the students.
His formal education consisted of perhaps 18 months of schooling from itinerant teachers at blab schools.
A blab school was where the school children repeated back their teacher's oral lesson at the top of their voices.
We are not irresponsible people who will "blab" in such a way as would do the country harm.
On the principle, they are agreed; on the "blab blah," they disagree.