I have no idea
You could either just not draw it in the draw loop (best solution) or makes it transparent (i.e. alpha = 0), in which case you would still be drawing it but it would be invisible.
Or you could draw it off the screen! @reefwing 's suggestion with not even drawing it is the best solution.
Codea redraws the screen 60 times a second, so anything you put there doesn’t stay there unless you keep redrawing it.
So hiding a sprite is as simple as just not deciding to draw it, as reefwing says
Can be a little confusing for anyone coming from an OO based game environment where Sprites are objects with a life of their own that can be programmed to move and alter between frames.
In Codea the sprite function means to copy an image from a file or an Image object onto the screen.