guilty as sin

adj

adj

Colloquial Unquestionably guilty.

Joe Feinberg, who supplied the decorative ceramic tiles for the Key Biscayne homes of both the President and Bebe Rebozo, thinks Nixon is "guilty as sin."1973 November 12, “The Jury of the People Weighs Nixon”, in Time:
[Julian:] And what do you think? [Sunday:] I think you're guilty as sin.1980, Paul Schrader, American Gigolo:

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