Webster's English Dictionary

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rein

1. rein \'ra-n\ n [ME reine, fr. MF rene, fr. (assumed) VL retina, fr. L 
   ret]ine-re to restrain - more at RETAIN 1: a line fastened to a bit on each 
   side by which a rider or driver control s an animal - usu. used in pl. 2a: 
   a restraining influence : CHECK  2b: controlling or guiding power  3: 
   complete freedom : SCOPE - usu. used in the phrase give rei n to
2. rein vt 1: to check or stop by or as if by a pull at the reins  2: to 
   control or direct with or as if with reins  archaic  1: to submit to the 
   use of reins  2: to stop or slow up one's horse or oneself by or as if by 
   pulling the re ins