rein
• noun 1 a long, narrow strap attached at one end to a horse’s bit, used in pairs to guide or check a horse. 2 (reins) the power to direct and control. • verb 1 check or guide (a horse) by pulling on its reins. 2 (often rein in/back) restrain. — PHRASES (a) free rein freedom of action or expression. keep a tight rein on exercise strict control over. — ORIGIN Old French rene, from Latin retinere ‘retain’.
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