Definition of herd:
(n) :
a number of beasts assembled together; as, a herd of horses, oxen, cattle, camels, elephants, deer, or swine; a particular stock or family of cattle; a crowd of low people; a rabble
"but far more numerous was the herd of such Who think too little and who talk too much. Dryden."
(v) :
to unite or associate in a herd; to feed or run together, or in company; as, sheep herd on many hills; to associate; to ally one's self with, or place one's self among, a group or company
"i'll herd among his friends, and seem One of the number. Addison."