rein Meaning in the Cambridge English Dictionary
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Meaning of “rein” in the English Dictionary

"rein" in British English

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reinnoun [C usually plural]

uk   us   /reɪn/
a ​long, ​thinpiece of ​material, ​especiallyleather, that ​helps you to ​control and ​direct a ​horse: You ​pull on both reins to ​stop or ​slow a ​horse, but only the ​left rein to ​turnleft. UK a ​strap that is put around a ​small child's ​body or ​wrist and ​held at the other end by an ​adult so that the ​adult can ​stop the ​childrunning away: I always put my ​son on reins when we go ​shopping.
(Definition of rein from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rein" in American English

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reinnoun [C usually pl]

 us   /reɪn/
a ​longthinpiece of ​material, esp. ​leather, used to ​control a ​horse
(Definition of rein from the Cambridge Academic Content Dictionary © Cambridge University Press)

"rein" in Business English

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uk   us   /reɪn/
the reins [plural] power and ​control of a ​business or other ​activity: These are the councillors who hold the reins of ​power. He handed the reins to his ​successor. I am ​retiring, and someone else can take over the reins.
free rein the freedom to do what you want to do: have free rein We were told we had ​free rein on ​questions of ​design. give sb/sth free rein (to do sth) She was given ​free rein to make all the ​changes she wanted.
give/allow sth full rein (also give/allow full rein to sth) to ​allow something to ​happen freely and completely: This is a ​post which will give your ​talentsfull rein. It's a ​task that ​requires you to ​allowfull rein to your imagination.
keep a tight rein on sth to ​control something very carefully: We need to ​keep a ​tight rein on the ​advertisingbudget.
(Definition of rein from the Cambridge Business English Dictionary © Cambridge University Press)
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“rein” in Business English

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