moral compass

noun
🔊/ˌmɒrəl ˈkʌmpəs/
🔊/ˌmɔːrəl ˈkʌmpəs/
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  1. the ability to judge what is right and wrong and to behave in an appropriate way
    • He is not the only politician who has lost his moral compass.他不是唯一一个失去道德指南针的政治家。