Real Dictionary

herd
A herd is a large group of animals of one kind that live together.
singular noun: If you say that someone has joined the herd or follows the herd, you are criticizing them because you think that they behave just like everyone else and do not think for themselves.
verb: If you herd animals, you make them move along as a group.
verb: If you herd people somewhere, you make them move there in a group.

herd in American English 1
a number of cattle, sheep, or other animals feeding, living, or being driven together
noun: a number of animals kept, feeding, or traveling together; drove; flock

herd in American English 2
a herdsman
noun: a herder
transitive verb: to tend, drive, or lead (cattle, sheep, etc.)

herd in British English 1
noun: a large group of mammals living and feeding together, esp a group of cattle, sheep, etc
verb: to collect or be collected into or as if into a herd

herd in British English 2
to drive forwards in a large group
noun: a person who tends livestock; herdsman