A principal or greatest sin; the most serious or fundamental transgression in religious or moral terms.
From 'arch-' (chief, worst) plus 'sin' (from Old English 'synn,' transgression). Creates a compound meaning the supreme or most important sin, often used theologically.
Christians talk about 'mortal sins' and 'venial sins,' but an 'archsin' would be *the* sin—like pride or greed—that leads to all the other sins!
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