(as) ugly as sin

idiom

Definition of (as) ugly as sin

informal
: very ugly That dog of yours is (as) ugly as sin.

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“(as) ugly as sin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28as%29%20ugly%20as%20sin. Accessed 5 Aug. 2020.

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