give free rein

Meaning

1. give / allow sb / sth free / full rein

   to give sb complete freedom of action; to allow a feeling to be expressed freely

   The designer was given free rein.

In the movies · 1

• That's your camera there, number two. I give you completely free rein.Sid and Nancy1986

From the same entry

• to keep a tight rein on
• rein back