When you mock someone and make fun of him, this is an example of how you denigrate him.
transitive verbden·i·grat·ed, den·i·grat·ing, den·i·grates
- To attack the character or reputation of; speak ill of; defame: “Speakers before the United States Chamber of Commerce rarely denigrate the businessman as an economic force” (John Kenneth Galbraith).
- To disparage; belittle: The movie critics denigrated the director's latest film. See Synonyms at disparage.
Origin of denigrateLatin dēnigrāre, dēnigrāt-, to blacken, defame : dē-, de- + niger, nigr-, black; see nekw-t- in Indo-European roots.
(third-person singular simple present denigrates, present participle denigrating, simple past and past participle denigrated)
From Latin dēnigrātus, the past participle of dēnigrāre (“to blacken”), from dē + nigrare 'to blacken (from niger (“black”))