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3. give free rein to

give free rein to

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give free rein to someone

 and give someone free rein

Fig. to allow someone to be completely in charge (of something). (Alludes to loosening the reins of a horse and therefore control.) The boss gave the manager free rein with the new project. The principal gave free rein to Mrs. Brown in her classes.

See also: free, give, rein

give free rein to

see under free hand.

See also: free, give, rein