free rein
noun
unhampered freedom of movement, choice, or action: Students have free rein to choose their own class schedules.
Origin of free rein
First recorded in 1950–55
Words nearby free rein
free press,
free radical,
free reach,
free reaching,
free recall,
free rein,
free ride,
free rider,
free running,
free safety,
free school
Idioms and Phrases with free rein
free rein
see free hand.