To talk excessively, foolishly, or noisily; to chatter or babble on about trivial matters (archaic).
From Latin 'deblaterate,' from 'de-' (away, thoroughly) + 'blaterare' (to babble). This is a rare English word from the 1500s-1600s that was borrowed from scholarly Latin.
This wonderfully obscure word shows how Renaissance scholars invented Latin-based insults—'deblaterate' was meant to sound as ridiculous as the excessive talking it described!
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