Broke a religious law or moral rule; did something considered seriously wrong in a religious context.
From Old English 'synn,' related to Old Norse 'synn' and likely Germanic roots. The concept of 'sin' is fundamental to Judeo-Christian theology but appears in similar forms across religions.
The concept of sin shaped how Western law developed—our ideas of guilt, forgiveness, and redemption all come from religious frameworks. Even atheists use 'that's sinful' to mean 'morally wrong,' showing how deeply religious language embedded itself in ethics.
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