besmirch (v.)youdaoicibaDictYouDict[besmirch 词源字典]
1590s, from be- + smirch.
Our Gayness and our Gilt are all besmyrcht. ["Henry V," IV.iii.110]
Related: Besmirched; besmirching.[besmirch etymology, besmirch origin, 英语词源]