rein /ˈren/
 □繩,統治,支配(vt.)駕馭,以□繩控制,統治,控制(vi.)勒住馬,止住
 Rein n.
 1. The strap of a bridle, fastened to the curb or snaffle on each side, by which the rider or driver governs the horse.
    This knight laid hold upon his reyne.   --Chaucer.
 2. Hence, an instrument or means of curbing, restraining, or governing; government; restraint. “Let their eyes rove without rein.”
 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.
 Rein, v. t. [imp. & p. p. Reined p. pr. & vb. n. Reining.]
 1. To govern or direct with the reins; as, to rein a horse one way or another.
    He mounts and reins his horse.   --Chapman.
 2. To restrain; to control; to check.
 Being once chafed, he can not
 Be reined again to temperance.   --Shak.
 To rein in or To rein up, (a) to check the speed of, or cause to stop, by drawing the reins. Hence, (a) to cause (a person) to slow down or cease some activity; -- to rein in is used commonly of superiors in a chain of command, ordering a subordinate to moderate or cease some activity deemed excessive.
 Rein, v. i. To be guided by reins. [R.]
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 rein
      n 1: one of a pair of long straps (usually connected to the bit
           or the headpiece) used to control a horse
      2: any means of control; "he took up the reins of government"
      v 1: control and direct with or as if by reins; "rein a horse"
           [syn: harness, rein in, draw rein]
      2: stop or slow up one's horse or oneself by or as if by
         pulling the reins; "They reined in in front of the post
         office" [syn: rein in]
      3: stop or check by or as if by a pull at the reins; "He reined
         in his horses in front of the post office" [syn: rein in]
      4: keep in check; "rule one's temper" [syn: rule, harness]