The Collaborative International Dictionary of English v.0.48:

Sweat \Sweat\, v. t.
   1. To cause to excrete moisture from the skin; to cause to
      perspire; as, his physicians attempted to sweat him by
      most powerful sudorifics.
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   2. To emit or suffer to flow from the pores; to exude.
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            It made her not a drop for sweat.     --Chaucer.
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            With exercise she sweat ill humors out. --Dryden.
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   3. To unite by heating, after the application of soldier.
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   4. To get something advantageous, as money, property, or
      labor from (any one), by exaction or oppression; as, to
      sweat a spendthrift; to sweat laborers. [Colloq.]
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   To sweat coin, to remove a portion of a piece of coin, as
      by shaking it with others in a bag, so that the friction
      wears off a small quantity of the metal.
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            The only use of it [money] which is interdicted is
            to put it in circulation again after having
            diminished its weight by "sweating", or otherwise,
            because the quantity of metal contains is no longer
            consistent with its impression.       --R. Cobden.
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The Collaborative International Dictionary of English v.0.48:

Sweat \Sweat\, v. i. [imp. & p. p. Sweat or Sweated (Obs.
   Swat); p. pr. & vb. n. Sweating.] [OE. sweten, AS.
   swaetan, fr. sw[=a]t, n., sweat; akin to OFries. & OS.
   sw[=e]t, D. zweet, OHG. sweiz, G. schweiss, Icel. sviti,
   sveiti, Sw. svett, Dan. sved, L. sudor sweat, sudare to
   sweat, Gr. ?, ?, sweat, ? to sweat, Skr. sv[=e]da sweat, svid
   to sweat. [root]178. Cf. Exude, Sudary, Sudorific.]
   1. To excrete sensible moisture from the pores of the skin;
      to perspire. --Shak.
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   2. Fig.: To perspire in toil; to work hard; to drudge.
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            He 'd have the poets sweat.           --Waller.
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   3. To emit moisture, as green plants in a heap.
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The Collaborative International Dictionary of English v.0.48:

Sweat \Sweat\, n. [Cf. OE. swot, AS. sw[=a]t. See Sweat, v.
   i.]
   1. (Physiol.) The fluid which is excreted from the skin of an
      animal; the fluid secreted by the sudoriferous glands; a
      transparent, colorless, acid liquid with a peculiar odor,
      containing some fatty acids and mineral matter;
      perspiration. See Perspiration.
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            In the sweat of thy face shalt thou eat bread.
                                                  --Gen. iii.
                                                  19.
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   2. The act of sweating; or the state of one who sweats;
      hence, labor; toil; drudgery. --Shak.
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   3. Moisture issuing from any substance; as, the sweat of hay
      or grain in a mow or stack. --Mortimer.
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   4. The sweating sickness. [Obs.] --Holinshed.
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   5. (Man.) A short run by a race horse in exercise.
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   Sweat box (Naut.), a small closet in which refractory men
      are confined.

   Sweat glands (Anat.), sudoriferous glands. See under
      Sudoriferous.

WordNet (r) 3.0 (2006):

sweat
    n 1: salty fluid secreted by sweat glands; "sweat poured off his
         brow" [syn: perspiration, sweat, sudor]
    2: agitation resulting from active worry; "don't get in a stew";
       "he's in a sweat about exams" [syn: fret, stew, sweat,
       lather, swither]
    3: condensation of moisture on a cold surface; "the cold glasses
       were streaked with sweat"
    4: use of physical or mental energy; hard work; "he got an A for
       effort"; "they managed only with great exertion" [syn:
       effort, elbow grease, exertion, travail, sweat]
    v 1: excrete perspiration through the pores in the skin;
         "Exercise makes one sweat" [syn: sweat, sudate,
         perspire]

Moby Thesaurus II by Grady Ward, 1.0:

327 Moby Thesaurus words for "sweat":
   BO, abide, ado, agitation, agonize, aim, all-overs, anguish,
   anxiety, await, bake, be determined, be in heat, beaded brow,
   beads of sweat, befuddlement, bewilderment, bide, blaze, bleed,
   bloom, body odor, boil, bother, botheration, breathless impatience,
   broil, burden, burn, burn to, burst, bustle, busy, chafe, chafing,
   chaos, chills of fear, choke, chyle, cloud, cold creeps,
   cold shivers, cold sweat, colostrum, combust, commotion, condense,
   confusion, cook, creeps, daze, diaphoresis, dirty work, discharge,
   discombobulation, discomfiture, discomposure, disconcertion,
   disorder, disorganization, disorientation, disquiet, disquietude,
   distill, disturbance, dither, dithers, do double duty, donkeywork,
   dribble, drip, dripple, drive, drop, drudge, drudgery, eagerness,
   elucubrate, embarrassment, employment, endeavor, excitement,
   exudate, exudation, exude, fag, fatigue, fear and trembling,
   feery-fary, ferment, fidgetiness, fighter, fighting man, filter,
   fit, flame, flame up, flap, flare, flare up, flicker, flummox,
   flurry, flush, fluster, flutter, flutteriness, fog, frenzy, fret,
   fretfulness, fretting, fry, fuddle, fuddlement, fume, fuss,
   fussiness, gasp, get excited, gleet, glow, goose bumps, gooseflesh,
   grind, gurgle, handiwork, handwork, hard work, hardly wait, haste,
   hasten, haze, heartquake, heebie-jeebies, hit the ball,
   honest sweat, horripilation, hubbub, hullabaloo, humor, hustle,
   ichor, impatience, impatientness, impetuousness, incandesce,
   industry, inquietude, itch to, jimjams, jitters, jumble,
   jump the gun, jumps, keep busy, labor, laboriousness, lachryma,
   lactation, lather, leach, leukorrhea, lick, lick of work,
   lixiviate, lucubrate, lymph, maelstrom, man-at-arms, manual labor,
   mark time, matter, maze, mess, milk, mist, moil, mucor, mucus,
   muddle, muddlement, mulct, nervousness, ooze, oppress, overdrive,
   overtask, overtax, overwork, palpitation, pant, parch,
   peccant humor, percolate, perplexity, perspiration,
   perspiration odor, perspire, perturbation, phlegm, pother,
   pour it on, pucker, purulence, pus, quaking, quiver of terror,
   quivers, radiate heat, rat race, resolve, restiveness,
   restlessness, rheum, roast, rook, ruffle, saliva, sanies, scald,
   scorch, scramble, scratch, scut work, seek, seep, seethe,
   serous fluid, serum, serviceman, sew, shakes, shimmer with heat,
   shivers, shuffle, simmer, sit up for, slave, slavery, slog,
   slogging, smolder, smother, snot, spadework, spark, spasm, spurt,
   spurtle, squirm, stay up for, steam, stew, stick, stifle, stir,
   strain, streams of sweat, strive, stroke, stroke of work, struggle,
   study, sudor, sudoresis, suffocate, suppuration, swaddy, swat,
   swatting, sweat and stew, sweat blood, sweat it out, sweat out,
   sweating, swelter, swirl, swivet, swot, swotting, task, tax, tear,
   teardrop, tense readiness, the whites, thrill of fear,
   tiresome work, tizzy, to-do, toast, toil, transude, travail,
   treadmill, trembles, trepidation, trepidity, trickle, tumult,
   uneasiness, unpatientness, unquiet, unquietness, unsettlement,
   upset, urine, vortex, wait, wait for, wait impatiently, wait on,
   wait up for, warrior, watch, watch and wait, water, weep, whirl,
   willies, wilt, work, work hard, work late, work overtime, worry