The Collaborative International Dictionary of English v.0.48:

Jib \Jib\ (j[i^]b), n. [Named from its shifting from side to
   side. See Jib, v. i.., Jibe.]
   [1913 Webster]
   1. (Naut.) A triangular sail set upon a stay or halyard
      extending from the foremast or fore-topmast to the
      bowsprit or the jib boom. Large vessels often carry
      several jibs; as, inner jib; outer jib; flying jib; etc.
      [1913 Webster]

   2. (Mach.) The projecting arm of a crane, from which the load
      is suspended.
      [1913 Webster]

   3. One that jibs, or balks; a jibber.
      [Webster 1913 Suppl.]

   4. A stationary condition; a standstill.
      [Webster 1913 Suppl.]

   Jib boom (Naut.), a spar or boom which serves as an
      extension of the bowsprit. It is sometimes extended by
      another spar called the flying jib boom. [Written also
      gib boom.]

   Jib crane (Mach.), a crane having a horizontal jib on which
      a trolley moves, bearing the load.

   Jib door (Arch.), a door made flush with the wall, without
      dressings or moldings; a disguised door.

   Jib header (Naut.), a gaff-topsail, shaped like a jib; a
      jib-headed topsail.

   Jib topsail (Naut.), a small jib set above and outside of
      all the other jibs.

   The cut of one's jib, one's outward appearance. [Colloq.]
      --Sir W. Scott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jib \Jib\, v. i. [Connected with jibe; cf. OF. giber to shake.]
   To move restively backward or sidewise, -- said of a horse;
   to balk. [Written also jibb.] [Eng.]
   [1913 Webster] Jib

The Collaborative International Dictionary of English v.0.48:

Jib \Jib\, v. t. & i. [imp. & p. p. Jibbed; p. pr. & vb. n.
   Jibbing.] Also Jibb \Jibb\ [Cf. Jib a sail, Gybe.]
   (Chiefly Naut.)
   To shift, or swing round, as a sail, boom, yard, etc., as in
   tacking.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

jib
    n 1: any triangular fore-and-aft sail (set forward of the
         foremast)
    v 1: refuse to comply [syn: resist, balk, baulk, jib]
    2: shift from one side of the ship to the other; "The sail
       jibbed wildly" [syn: jibe, gybe, jib, change course]

Moby Thesaurus II by Grady Ward, 1.0:

136 Moby Thesaurus words for "jib":
   avert, avoid, back down, balance, balk, balloon sail, batten,
   bear off, blench, blink, boggle, cringe, debate, deliberate, demur,
   dodge, draw aside, draw back, duck, ease off, edge off, evade,
   fade, fall back, falter, fear, fight shy, flinch, fly off,
   fly-by-night, flying kites, fore gaff-topsail,
   fore topgallant sail, fore-skysail, fore-topmast staysail,
   fore-topsail, foreroyal, foresail, forestaysail, gag, gee, glance,
   glance off, go off, hang back, haw, head off, hem and haw,
   hesitate, hover, hum and haw, jenny, jigger, jump, jump a mile,
   leg-of-mutton sail, loose-footed sail, lug, main gaff-topsail,
   main royal, main skysail, main-royal staysail, main-topsail,
   mainsail, make way for, mizzen, mizzen skysail, mizzen staysail,
   mizzen-royal staysail, mizzen-topgallant sail, moonraker, moonsail,
   move aside, panic, parachute spinnaker, pause, ponder, pull back,
   quail, recoil, reef, reef point, reel back, retreat, royal,
   scruple, sheer off, shilly-shally, shove aside, shrink,
   shrink back, shunt, shy, shy off, side, sidestep, sidetrack, sidle,
   skedaddle, skyscraper, spanker, spinnaker, spitfire, square sail,
   stampede, start, start aside, start back, startle, staysail,
   steer clear of, step aside, stern staysail, stick, stick at,
   stickle, stop to consider, storm trysail, straddle the fence,
   strain, strain at, stumble, swerve, switch, think twice about,
   topsail, trysail, turn aside, turn away, turn back, veer off,
   weasel, weasel out, wince, withdraw, yield