free rein
• freedom of action or expression.
• "he was given free rein to work out his designs"
Similar:
freedom,
scope,
a free hand,
leeway,
latitude,
elbow room,
space,
room,
flexibility,
liberty,
independence,
play,
slack,
free play,
leisure,
licence,
room to manoeuvre,
scope for initiative,
freedom of action,
freedom from restriction,
indulgence,
laxity,
margin,
wriggle room,
wiggle room,
carte blanche,
