cud
n.— «Major Die Breaks are often referred to as “cuds,” a slang holdover term from the 1960s that stuck. A cud occurs when a section of the die face and corresponding shank breaks away and leaves a void in the die in its place. The die will then strike coins with a raised blob of unstruck metal that has been partially forced up into the void during the strike.» —“Errors Found in Search” by Ken Potter Numismaster.com July 10, 2008. (source: Double-Tongued Dictionary)
Further reading
Is there such a thing as a “neutral” accent, and if so what does it sound like? And that quirk in the way southern Californians talk about freeways. They’ll say things like take the 405 and get on the 8. Why the definite article...
When Bebe, a non-native English speaker in Charlotte, North Carolina, moved from England to the United States, she learned that a minor illness isn’t called the lurgy but the crud. In the 1700s, lurgy was used jokingly to refer to “a vague medical...