a group of cattle or sheep or other domestic mammals all of the same kind that are herded by humans
"The farmer guided his herd of dairy cows across the green pasture to the waiting barn."
a group of wild mammals of one species that remain together: antelope or elephants or seals or whales or zebra
"The safari guide warned us to keep our distance as the herd of zebras began their migration across the savanna."
A number of domestic animals assembled together under the watch or ownership of a keeper.
"The experienced herd rounded up the stray cows before nightfall."
Someone who keeps a group of domestic animals; a herdsman.
In plain English: A herd is a large group of animals that live and travel together, such as cows or elephants.
"The farmer gathered the cattle into a tight herd to cross the field safely."
Usage: Use "herd" as a noun for any large group of grazing livestock like cattle, sheep, or deer that move and graze together under human care. As a verb, it describes the action of these animals gathering in groups or being guided by a keeper to do so.
move together, like a herd
"The tourists moved through the dusty trail in a tight cluster, just as a herd would on its way to water."
To unite or associate in a herd; to feed or run together, or in company.
"The experienced cowboy will herd the cattle to the new pasture at dawn."
To act as a herdsman or a shepherd.
In plain English: To herd means to push or guide a group of animals together so they move as a single unit.
"The rancher needs to herd the cattle back into the corral before sunset."
The word "herd" comes from Old English hierd, which originally meant both a flock of animals and the act of keeping or caring for them. This term traveled into Middle English with that same dual meaning before becoming part of modern usage.