The Collaborative International Dictionary of English v.0.48:

Fetter \Fet"ter\, v. t. [imp. & p. p. Fettered; p. pr. & vb.
   n. Fettering.]
   1. To put fetters upon; to shackle or confine the feet of
      with a chain; to bind.
      [1913 Webster]

            My heels are fettered, but my fist is free.
                                                  --Milton.
      [1913 Webster]

   2. To restrain from motion; to impose restraints on; to
      confine; to enchain; as, fettered by obligations.
      [1913 Webster]

            My conscience! thou art fettered
            More than my shanks and wrists.       --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fetter \Fet"ter\ (f[e^]t"t[~e]r), n. [AS. fetor, feter; akin to
   OS. feter[=o]s, pl., OD. veter, OHG. fezzera, Icel.
   fj["o]turr, L. pedica, Gr. pe`dh, and to E. foot. [root] 77.
   See Foot.] [Chiefly used in the plural, fetters.]
   1. A chain or shackle for the feet; a chain by which an
      animal is confined by the foot, either made fast or
      disabled from free and rapid motion; a bond; a shackle.
      [1913 Webster]

            [They] bound him with fetters of brass. --Judg. xvi.
                                                  21.
      [1913 Webster]

   2. Anything that confines or restrains; a restraint.
      [1913 Webster]

            Passion's too fierce to be in fetters bound.
                                                  --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fetter
    n 1: a shackle for the ankles or feet [syn: fetter, hobble]
    v 1: restrain with fetters [syn: fetter, shackle]

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "fetter":
   Oregon boat, anchor, arrest, bearing rein, bilbo, bind, bit, bond,
   bonds, brake, bridle, burden, camisole, chain, chains, check,
   checkrein, chock, clog, collar, countercheck, cramp, cripple,
   cuffs, cumber, curb, curb bit, damper, doorstop, drag, drag sail,
   drift anchor, drift sail, drogue, embarrass, enchain, encumber,
   enmesh, ensnarl, entangle, entoil, entrammel, entrap, entwine,
   fasten, gag, gyve, gyves, halter, hamper, hamstring, handcuff,
   handcuffs, handicap, harness, hitch up, hobble, hobbles, hog-tie,
   holdback, hook up, hopple, hopples, impede, involve, irons, lame,
   lash, leading strings, leash, lime, lumber, make fast, manacle,
   martingale, moor, muzzle, net, peg down, pelham, picket, pillory,
   pin down, pinion, press down, put in irons, reins, remora,
   restrain, restraint, restraints, rope, saddle, saddle with, scotch,
   sea anchor, secure, shackle, snaffle, snarl, spoke, stay, stocks,
   stop, straightjacket, strait-waistcoat, straitjacket, stranglehold,
   strap, tangle, tether, tie, tie down, tie up, toil, trammel,
   trammels, weigh down, yoke