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| Date: | 1200-1300 |
| Language: | Old French |
| Origin: | rene, from Latin retinere; RETAIN |
1DSH [countable usually plural] a long narrow band of leather that is fastened around a horse's head in order to control it [↪ bridle]
2 to allow an emotion or feeling to be expressed freely : 
He gave free rein to his imagination.
give (full/free) rein to something
He gave free rein to his imagination.3 to give someone complete freedom to do a job in whatever way they choose
give somebody (a) free rein
4 to control something strictly : The finance director keeps a tight rein on spending.
keep a tight rein on somebody/something
The finance director keeps a tight rein on spending.5 to take or give someone control over an organization or country : Owens will officially take over the reins in a few weeks.
take/hand over the reins
Owens will officially take over the reins in a few weeks.