[1] : The Collaborative International Dictionary of English v.0.48

rein \rein\ r?n, n. f. r^ene, fr. assumed ll. retina, fr.
   l. retinere to hold back. see retain.
   1. the strap of a bridle, fastened to the curb or snaffle on
      each side, by which the rider or driver governs the horse.
      1913 webster

            this knight laid hold upon his reyne. --chaucer.
      1913 webster

   2. hence, an instrument or means of curbing, restraining, or
      governing; government; restraint. "let their eyes rove
      without rein." --milton.
      1913 webster

   to give rein, to give the rein to, to give license to; to
      leave withouut restrain.

   to take the reins, to take the guidance or government; to
      assume control.
      1913 webster
see also:
retain to give rein to give the rein to to take the reins 

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