Black"guard (?), n. [Black + guard.]
1.
The scullions and lower menials of a court, or of a nobleman's household, who, in a removal from one residence to another, had charge of the kitchen utensils, and being smutted by them, were jocularly called the "black guard"; also, the servants and hangers-on of an army.
[Obs.]
A lousy slave, that . . . rode with the black guard in the duke's carriage, 'mongst spits and dripping pans.
Webster (1612).
2.
The criminals and vagrants or vagabonds of a town or community, collectively.
[Obs.]
3.
A person of stained or low character, esp. one who uses scurrilous language, or treats others with foul abuse; a scoundrel; a rough.
A man whose manners and sentiments are decidedly below those of his class deserves to be called a blackguard.
Macaulay.
4.
A vagrant; a bootblack; a gamin.
[Obs.]
© Webster 1913.
Black"guard`, v. t. [imp. & p. p. Blackguarded; p. pr. & vb. n. Blackguarding.]
To revile or abuse in scurrilous language.
Southey.
© Webster 1913.
Black"guard, a.
Scurrilous; abusive; low; worthless; vicious; as, blackguard language.
© Webster 1913.