REIN

I. noun see: retain Date: 14th century a strap fastened to a bit by which a rider or driver controls an animal, 2. a restraining influence ; check , controlling or guiding power, opportunity for unhampered activity or use , II. verb Date: 15th century transitive verb to control or direct with or as if with ~s, to check or stop by or as if by a pull at the ~s , intransitive verb to submit to the use of ~s, to stop or slow up one's horse or oneself by or as if by pulling the ~s