Meaning of “take over/up the reins” in the English Dictionary

british dictionary

"take over/up the reins" in British English

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take over/up the reins

to take control of something, especially an organization or a country:

He took up the reins of government immediately after the coup.

(Definition of “take over/up the reins” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)