show someone in a bad light
US /ʃoʊ ˈsʌmˌwʌn ɪn ə bæd laɪt/
UK /ʃoʊ ˈsʌmˌwʌn ɪn ə bæd laɪt/

1.
抹黑某人, 让某人显得不好
to make someone appear bad or guilty
:
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The article tried to show him in a bad light, but he remained popular.
这篇文章试图抹黑他,但他仍然很受欢迎。
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Don't let your mistakes show you in a bad light to your boss.
不要让你的错误让老板对你印象不好。