The term caveat emptor is taken from Roman law and means in Latin, "let the buyer beware". In the absence of a stated guarantee or warranty from the seller, a buyer takes what he buys, "as is", and...
Basically, the off-side rule is to prevent a player from just having a one on one chance with the goalie to try and score. Therefore, a player is ruled "off-side" if he is in front of everybody else...