"blackguard" in the noun sense
1. cad, bounder, blackguard, dog, hound, heel
someone who is morally reprehensible
"you dirty dog"
"blackguard" in the verb sense
1. ridicule, roast, guy, blackguard, laugh at, jest at, rib, make fun, poke fun
subject to laughter or ridicule
"The satirists ridiculed the plans for a new opera house"
"The students poked fun at the inexperienced teacher"
"His former students roasted the professor at his 60th birthday"
2. abuse, clapperclaw, blackguard, shout
use foul or abusive language towards
"The actress abused the policeman who gave her a parking ticket"
"The angry mother shouted at the teacher"
Source: WordNet® (An amazing lexical database of English)
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