This phrase is used figuratively and implies control without physical means, like using real reins. The CEO keeps a tight rein on the company’s finances to ensure stability.
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Metaphoric Origin
Originates from horse riding where reins are used for control; thus suggesting hands-on management or supervision. The director keeps a tight rein on the movie production to maintain his vision.
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Strict Supervision
Emphasizes strict supervision or limitations placed on behavior, often to maintain order or discipline. Teachers must keep a tight rein on students during field trips.