To spray (a liquid).
The -un imp. focuses on the object that is being sprayed. The -an focuses on s.o. that you are directing the spray or spit at but it doesn't hit them. It can also focus on the object that is being spit or sprayed from one's mouth.
If you want your chicken to be healthy, you should spray water (from your mouth) on it every day.
What do you use to spray your plants with?
If you have lots of blood in your mouth, spit it out so you don't swallow it.