A serious misdeed is often referred to as a SIN. The term 'SIN' is derived from the Old English word 'syn', which means 'to miss the mark'. It is used to describe an action or behavior that goes against the moral code of a particular religion or society. In Christianity, SIN is seen as an offense against God and is punishable by spiritual death. In other religions, SIN is seen as an offense against the gods or the natural order of the universe.