Etymology
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blackguard (n.)

1530s, "scullion, kitchen knave," of uncertain origin. Perhaps in reference to military units or attendants so called for the color of their dress or their character; more likely originally a mock-military reference to scullions and kitchen-knaves of noble households, of black-liveried personal guards, and of shoeblacks. See black (adj.) + guard (n.). By 1736, sense had emerged of "one of the idle criminal class; man of coarse and offensive manners." Hence the adjectival use (1784), "of low or worthless character."

updated on December 01, 2017

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Definitions of blackguard from WordNet
1
blackguard (v.)
subject to laughter or ridicule;
Synonyms: ridicule / roast / guy / laugh at / jest at / rib / / poke fun
blackguard (v.)
use foul or abusive language towards;
Synonyms: abuse / clapperclaw / shout
2
blackguard (n.)
someone who is morally reprehensible;
Synonyms: cad / bounder / dog / hound / heel
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.