Hold the reins

verb

Definitions

Verb
  1. 1
    To be in charge, to be in control, as of a business, political organization, or other group. idiomatic

    "These terms . . . will place the future behavior of Germany at the dictation of the associated powers regardless of what form of provisional government may hold the reins at Berlin."

Etymology

A metaphor, based on the usual method of controlling a horse or a team of horses.

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