The term spu has been falsely traced to a 19th century activist group dedicated to keeping the potato out of Britain, calling itself The Society for the Prevention of an Unwholesome Diet. However, the correct etymology of "spud" is that this word for potato comes from the digging of soil/hole prior to planting the potatoes. The word is of unknown origin and was originally (c. 1440) used as a term for a short knife or dagger, probably related to Dutch spyd. It subsequently transferred over to a variety of digging tools. Around 1845 it transferred over to the tuber itself.