Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
ride herd on: watch closely and control someone
Example:
Jane is a competent adult – you don’t have to ride herd on her to make sure she finishes the project on time.
road hog, ball hog, etc.: someone who takes more than his share of the item
Example:
Nobody wants Sam on their team because he’s such a ball hog.