denigrateகளங்கப்படுத்துkaḷaṅkappaṭuttu(kaḷangappaḍuttu)(3 tr)blacken (the name, reputation) of; lower the value of reputation of; disparage, belittle, diminish, deprecate, detract from, decry, defame, slander, libel, cast aspersions on; sully; vilify; calumnify; (inf.) badmouth, diss
Usage:
அந்த ஒரு சிறிய தவறுக்காக அவனைக் களங்கப்படுத்துவது அவசியம் இல்லைanta oru ciṟiya tavaṟukkāka avaṉaik kaḷaṅkappaṭuttuvatu avaciyam illai
anda oru sinna tappukkaaha avane kaḷangappaḍutta avasiyam ille
You don't have to denigrate him just for that one little mistake.
