The act of encroachment refers to when someone is invading your space or your zone in an innapropriate way. Encroachment happens on all levels whether it's your older brother
dropping game on your
girlfriend, or when your roomates friend stays at your house for over a week and drinks all of your soymilk.
Note: When being encroached upon, one can
throw a red flag or call a foul in order to identify and prevent any further damage which may be caused.