Besmirch

That news will besmirch his reputation for honesty.

Please don't do anything that would besmirch the Matsuno family name!

You'll never be able to besmirch my name.

The scandal threatened to besmirch the company's image.

The newspaper was on a campaign to besmirch the actor.

Our gayness and our gilt are all besmirch'd With rainy marching in the painful field

"It may be," he replied, "because I will not encounter the dishonor that besmirches the husband of a faithless woman.[…]"

Sir Guy might still have slain him without besmirching his knightly honor