talk nineteen to the dozen talk incessantly. British
☞ No convincing reason has been put forward as to why nineteen should have been preferred in this idiom rather than twenty or any other number larger than twelve.
1998Pamela JoosteDance with a Poor Man's Daughter He hasn't even got his foot in the door before she's talking nineteen to the dozen and hanging round his neck and asking if he's got sweets in his pocket.