I use neither wait nor stay.
I use stand, sit or down; the position must be maintained until and unless I release the dog or give another command.
This, IMHO, is easier for the dog to understand; I am a firm believer that the other two words are superfluous as they do not add anything to the equation, are “abstract” and imbue the dog with an understanding that they do not possess.
these words ahve been handed down through the years via superstition.
Any dog can be trained to stay, however most people do not put the same amoutn of effort into training stays as they do in everything else.
More competitions are lost on stays than on all the other exercises put together!
It must be done gradually working on the four different variables of