BLACKGUARD n.
esidence 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).…
COCK n.
cock, At full cock, with the hammer raised and ready to fire; -- said of firearms, also, jocularly, of one prepared for instant action. -- At half cock. See under Half. -- Cock feather (Archery), the feather of an arrow at right angles to the direction of the cock or notch. Nares.