(sociology) the tendency of a group of individuals (a herd) to react coherently without there being any coordination between them. The term may be applied to animals, or to human phenomena such as stock market bubbles and behaviour in political demonstrations.

(sociology) A social tendency in humans to identify with and model many behaviors and beliefs after a larger group of individuals with whom they identify.

(transitive, idiomatic, US) To supervise a group of people and their work.

A dog bred for working cattle, sheep, or other livestock. For example, the various shepherd breeds.

present participle of herd cats

(sports) A non-official path created by hikers, and usually maintained by the hikers themselves.

(epidemiology) The indirect protection against the spread of a contagious disease in a given population caused by the immunity of a significant proportion of the population to that particular disease; the immunity may have been obtained through having survived the infection or through vaccination.

A stud boar, a male pig kept for breeding.

plural of herding dog

To push people or animals into a group, as a herd.