Baker's dozen

[L]et him caſt his Eye upon the laſt Page of that Book, where Mr. Blount has tranſlated a Quotation out of Scaliger de Emend. brought by the Author of the Præadamitæ; now he tranſlates Octingenties octagies, not eight hundred and eighty, but eight hundred and eightſcore; as if the Romans had uſed to reckon by ſcores. He might altogether as well, have made them number by Bakers-Dozens.

A Baker's Dozen, Treize dans la Douzaine.

What! though by accident we've loſt / Of provinces a baker's dozen; / More bleſſings has our King produc'd, / By our good Queen his German couſin—

Maffæus [Maffeo Vegio] seems to have thought that the liberal mind of Virgil could never have been satisfied with giving his readers less than a baker's dozen for their money, and therefore he added a thirteenth to the numbers of the Æneid, such as he imagined the Mantuan would himself have written if he had lived to perfect his own design.

Well, what do you think I'll give you? Why, fourteen kisses, and that's a baker's dozen you know; and so no more at present, from yours till I'm married, […] [I]n the disposal of her baker's dozens, she is admonished not to be profuse; and, moveover, not to be any body's till she is married, not even her well-wisher's.

When some half dozen of bakers' dozens of constables are to be created, is it not very tiresome that a magistrate shall sit in an easy arm chair, in a snug room, and before a roaring fire, whilst the oath is read to each, and whilst each kisses the book, until the moisture of their breath has saturated with damp, the sheep or calf skin in which the book is packed up? There is something very tedious and unpleasant in all this, and great praise is due to the steward of Squire Screw, for having invented the means by which such annoying forms may be set aside.

"[…] But the police have an idea that I committed—" / "What—for the love of Mike?" / "Murder!" / "Good heavens!" / "And that isn't all, Bob. They've a couple of bakers' dozens of witnesses, all cocked and primed to swear to it!"

Around the thirteenth century, bakes began to add an extra loaf to every dozen. They did not want to be accused of cheating their customers. So 13 items has become known as a baker's dozen. […] Today, some bakers still bake bread in "baker's dozens."

"Before I agree to help you and your baker's dozen over there …" Rose nodded at Larry. / "It means cousin," Larry said. / "Before I say yes to helping, I would like a low-risk, up-front agreement."