rein
Pronunciation: /reɪn/
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Definition of rein
noun
(usually reins)verb
Phrases
Origin:
Middle English: from Old French rene, based on Latin retinere 'retain'
The idiomatic phrase a free rein, which derives from the literal meaning of using reins to control a horse, is sometimes misinterpreted and written as a free reign. More than a third of the citations for the phrase in the Oxford English Corpus use reign instead of rein.