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Definition of cardinal sin noun from the Oxford Advanced Learner's Dictionary

cardinal sin

noun

/ˌkɑːdɪnl ˈsɪn/

/ˌkɑːrdɪnl ˈsɪn/

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(sometimes humorous) an action that is a serious mistake or that other people think is bad
- He committed the cardinal sin of criticizing his teammates.
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a serious sin in the Christian Church

See cardinal sin in the Oxford Advanced American Dictionary

Check pronunciation: cardinal sin

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