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cull the herd
1. Literally, to separate or remove (and usually kill) inferior animals out of a herd so as to reduce numbers or remove undesirable traits from the group as a whole. We had to quickly cull the herd when it came to light that some cows might be carrying an infectious disease.
2. By extension, to separate or remove people from a larger group. With so many people applying for a limited number of jobs, employers have had to cull the herd by introducing much stricter criteria and a more elaborate application for hiring. Universities have long used standardized test results as a means of culling the herd of applicants they receive each year.
be like herding cats
To be very unwieldy or unmanageable; to be nearly impossible to organize. Usually said of a group of people. Getting all of the extended family into their right places for the reunion photo was like herding cats! It's like herding cats trying to manage all these different software development teams.
To attempt to coordinate or control subjects that are uncooperative. Often used as a point of comparison in the phrase "like herding cats." Trying to get my two toddlers out the door these days is like herding cats!
herd someone or something together
to bunch people or animals together. Let's herd all the kids together and take them in the house for ice cream and cake. I herded all the puppies together and put them in a box while I cleaned their play area.
like herding frogs
Rur. chaotic; disorderly. (On the image of trying to direct frogs, which will jump any which way.) Trying to get those kids to march into the auditorium is like herding frogs. Trying to get everybody to cooperate is like herding frogs.
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.
ride herd on somebody/something(American)
to be responsible for controlling a group of people and their actions The new editor will ride herd on the staff, checking on the overall policy and tone of the paper.
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]
ride herd on
To keep watch or control over.