The word "ditter" is believed to have originated from the Middle English term "diteren", which emerged around the 14th century. "Diteren" was used to describe the irregular vibration or trembling of various objects, particularly in relation to the rapid movement of wings or legs.
This medieval term is believed to have derived from the Old Norse word "ditta", which meant "to tremble" or "to shudder". The Old Norse word, in turn, can be traced back to the Proto-Germanic root "*dittaz", with a similar meaning of "to shiver" or "to quiver".
Over time, the spelling and pronunciation of "diteren" shifted, eventually evolving into the modern form "ditter" that is seen today.