cardinal sin

noun
🔊/ˌkɑːdɪnl ˈsɪn/
🔊/ˌkɑːrdɪnl ˈsɪn/
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  1. (sometimes humorous) an action that is a serious mistake or that other people think is bad严重过失;过错
    • He committed the cardinal sin of criticizing his teammates.他犯了指责队友的大错。🔊🔊
  2. a serious sin in the Christian Church (基督教中严重的)罪,罪孽