ride herd on, to

ride herd on someone or something

Fig. to supervise someone or something. (Alludes to a cowboy supervising cattle.) I'm tired of having to ride herd on my kids all the time. My job is to ride herd on this project and make sure everything is done right.
See also: herd, on, ride
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

ride herd on

Keep close watch or tight control over, as in Aunt Martha is always riding herd on her bridge club, making sure they follow the rules . This idiom alludes to the cowboy who rides around a herd of cattle to keep them together. [Late 1800s]
See also: herd, on, ride
The American Heritage® Dictionary of Idioms by Christine Ammer.

ride herd on

keep watch over.
Literally, this North American expression means ‘guard or control a herd of cattle by riding round its edge’.
1999 Coloradoan (Fort Collins) That, in turn, would detract from his ability to ride herd on Washington special interests, allowing deficits to grow like mushrooms under a rotten log.
See also: herd, on, ride
Farlex Partner Idioms Dictionary

ride herd on

To keep watch or control over.
See also: herd, on, ride
American Heritage® Dictionary of the English Language, Fifth Edition.

ride herd on, to

To control, boss. This phrase originally meant to control or guard a herd of cattle by riding on its perimeter. Its figurative use dates from the late nineteenth century, and it remains current. The mystery novelist Ed McBain used it in Long Time No See (1977): “Two men who should be taking care of people getting robbed or mugged, go to waste our time instead of riding herd on a bunch of street hoodlums.”
See also: herd, ride
The Dictionary of Clichés by Christine Ammer
See also:
  • thanks for the ride
  • after a fashion
  • a bumpy ride
  • a rough ride
  • take (someone) for a ride, to
  • ride about
  • ride about (something)
  • ride
  • ride hard and put (something) up wet
  • rode hard and put away wet