cardinal sin

noun

Definition of cardinal sin

: a very bad or serious sin in Christianity often used figuratively or humorouslyGiving false information is a cardinal sin in news reporting.He committed the cardinal sin of criticizing his boss.

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“Cardinal sin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cardinal%20sin. Accessed 30 May. 2020.

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