Don't be a discredit to the collective.

别给集体丢脸。

《新英汉大辞典》

Don't be a discredit to your school.

不要给你们的学校丢脸。

youdao

I think it's a discredit to women to suggest they wouldn't be able to recognize that a guy is kind and worthwhile even though he might be a little chubby.

我想，如果认为女人们无法辨别一个看上去胖胖的男人的优点，那是破坏女人的名声。

youdao

Put simply, tax cuts are too important to waste, and it would be a shame to discredit the undeniable good that comes from simplification and across-the-board reduction on a tax plan that subsidizes some at the expense of others, and which addresses yesterday's rather than tomorrow's economy.

FORBES: Political Economy

And once again I would just appeal that everything that you undertake must be done in a peaceful and dignified manner, and not to bring any discredit on the colour which we wear.

BBC: Day of reckoning passes peacefully

At the end of that time, he gave a press briefing by speakerphone to seven journalists, in part so as to discredit his would-be autobiographer, Mr Irving.

ECONOMIST: Strange tycoons