Baker's dozen

A baker's dozen is 13, one more than a regular dozen. It is also known as a long dozen or devil's dozen.[1]

This can also be explained by when a baker makes 1 extra loaf of bread incase a mistake happens.

References

  1. ↑ "Devil", Concise Oxford English Dictionary: Luxury Edition, vol. 12, Oxford University Press, 2011, p. 392, ISBN 9780199601110.