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tight rein on, a

Idioms  
  1. Strict control over, as in We told them to keep a tight rein on spending for the next year. This expression alludes to the narrow strap (rein) attached to a bit and used to control a horse's movements. Rein has been used to refer to any kind of restraint since the first half of the 1400s.


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Scaramucci’s departure Monday is a good start, but Kelly will have to keep a tight rein on a White House staff that is used to few boundaries.

From Washington Post ● Jul. 31, 2017

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