Rubbing her eyes, she tried to rein in her scattered thoughts.
I gave him free rein to do what he needs to.
If you gave me free rein I'd have every kind of animal there was.
The name Rhine, which is apparently of Celtic origin, is of uncertain etymology, the most favoured derivations being either from der Rinnende (the flowing), or from Rein (the clear), the latter being now the more generally accepted.
Given free rein to improvise as he saw fit, the law student had found the employee and created his own sting.