Take the reins

Take the reins is an idiom that has been in use for hundreds of years. An idiom is a commonly used word, group of words, or phrase that has a figurative meaning that is not easily deduced from its literal definition. Often using descriptive imagery or metaphors, common idioms are words and phrases used in […]
from Grammarist
https://grammarist.com/usage/take-the-reins/