horse guard

a black and yellow sand wasp, Bembix carolina, of the southern U.S., preying on flies that gather around horses and cattle.

Origin of horse guard

First recorded in 1790–1800

The boy gave the orders tersely after the horse-guard had risen and kicked his two companions awake.

The King of Arcadia |Francis Lynde
The horse-drive of the previous night was an exception, but that had happened because they had drawn near and seen no horse-guard.

The Hunters' Feast |Mayne Reid
But in a few moments this officer whispered something to the horse-guard with him, and the latter started for the door.

The Road to Paris |Robert Neilson Stephens
The horse-guard only, out by the caballada, stood leaning upon his rifle, silent and watchful.

The Scalp Hunters |Mayne Reid

We reminded the captain that a hundred Pawnees would probably demolish the horse-guard, if he were to resist their depredations.

The Oregon Trail |Francis Parkman, Jr.