talk nineteen to the dozen

Momoを読んでいます。ついに 'Men in grey' をやっつけMomoの話は終わりに向かいます。
At long last, Beppo shouldered his broom -- he took the rest of the day off, of course -- and the two of them strolled arm in arm through the city to the old amphitheatre, still talking nineteen to the dozen.
"talking nineteen to the dozen" はいつまでも話続けたの意味だと推測できますが、慣用句として辞書に載っているか確認します。
・Oxford English Dictionary: Talk incessantly.: She talks nineteen to the dozen, amusingly, self - deprecatingly, practically, irreverently.
・Dictionary.com: to talk very rapidly or vehemently: Whenever I'm excited I talk nineteen to the dozen.