unhampered freedom of movement, choice, or action: Students have free rein to choose their own class schedules.
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Origin of free rein
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Idioms and Phrases with free rein
see free hand.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.