The Collaborative International Dictionary of English v.0.48:

Tremble \Trem"ble\, n.
   An involuntary shaking or quivering.
   [1913 Webster]

         I am all of a tremble when I think of it. --W. Black.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tremble \Trem"ble\, v. i. [imp. & p. p. Trembled; p. pr. & vb.
   n. Trembling.] [F. trembler, fr. L. tremulus trembling,
   tremulous, fr. tremere to shake, tremble; akin to Gr. ?,
   Lith. trimti. Cf. Tremulous, Tremor.]
   1. To shake involuntarily, as with fear, cold, or weakness;
      to quake; to quiver; to shiver; to shudder; -- said of a
      person or an animal.
      [1913 Webster]

            I tremble still with fear.            --Shak.
      [1913 Webster]

            Frighted Turnus trembled as he spoke. --Dryden.
      [1913 Webster]

   2. To totter; to shake; -- said of a thing.
      [1913 Webster]

            The Mount of Sinai, whose gray top
            Shall tremble.                        --Milton.
      [1913 Webster]

   3. To quaver or shake, as sound; to be tremulous; as the
      voice trembles.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tremble
    n 1: a reflex motion caused by cold or fear or excitement [syn:
         tremble, shiver, shake]
    v 1: move or jerk quickly and involuntarily up and down or
         sideways; "His hands were trembling when he signed the
         document"

Moby Thesaurus II by Grady Ward, 1.0:

132 Moby Thesaurus words for "tremble":
   Bebung, all-overs, be cold, bob, bobble, bounce, bump, chatter,
   chill, cold shivers, cold sweat, cower, didder, disquiet,
   disquietude, dither, dithers, dodder, falter, fidget, fidgetiness,
   fidgets, flip out, flutter, freak out on, freeze, freeze to death,
   get high on, glow, go pitapat, grimace, grow cold, halt,
   have a chill, have an ague, have goose pimples, have the fidgets,
   have the jitters, have the shakes, heave, heaving, heebie-jeebies,
   horripilate, hustle, inquietude, jactitate, jar, jerk, jig, jigget,
   jiggle, jimjams, jitter, jitters, jog, joggle, jolt, jostle,
   jounce, jump, jumps, limp, lose heat, palpitate, palpitation, pant,
   panting, perish with cold, pitapat, pitter-patter, quail, quake,
   quaking, quaver, quavering, quiver, quivering, quivers,
   restlessness, rictus, rock, shake, shake all over, shakes, shaking,
   shiver, shivers, shock, shrink, shudder, squirm, sweat, swell,
   swell with emotion, teeter, thrill, thrill to, throb, throbbing,
   tic, tingle, tingle with excitement, toss, toss and turn, totter,
   trembles, trembling, tremolando, tremolant, tremolo, tremor,
   trepidation, trepidity, trill, trillet, trilleto, trillo, tumble,
   turn on to, twist and turn, twitch, twitter, unrest, vibrate,
   vibration, vibrato, wiggle, willies, wince, wobble, wriggle,
   writhe