ride herd on someone/something
ride herd on someone/somethingAMERICAN
If someone rides herd on other people or their actions, they control them. It's his job to ride herd on organizers to keep them on schedule. Note: People sometimes use over instead of on. The ideal situation is one where everyone feels responsible and no one person has to ride herd over the others. Note: Originally, `riding herd' involved patrolling on horseback around a herd of animals, in order to make sure none of them wandered away.