How to Say "reins" in Spanish
The Spanish word for “reins” is “rienda” — B2 level. This is a very common word in everyday Spanish.
English → SpanishB2
nounB2
figurative control

Examples
Ella tomó las riendas del negocio familiar tras la jubilación de su padre.
She took the reins of the family business after her father's retirement.
No le des rienda suelta a tu imaginación.
Don't give free rein to your imagination.
Es importante tomar las riendas de tu propia vida.
It is important to take control of your own life.
Always Feminine
Even when referring to 'control' (which is masculine in Spanish), 'rienda' is always a feminine word. You always say 'las riendas'.
Missing 'las'
Mistake: “Tomar riendas de la situación.”
Correction: Tomar las riendas de la situación.
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