The Collaborative International Dictionary of English v.0.48:

Trim \Trim\, v. i.
   To balance; to fluctuate between parties, so as to appear to
   favor each.
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The Collaborative International Dictionary of English v.0.48:

Trim \Trim\, n.
   1. Dress; gear; ornaments.
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            Seeing him just pass the window in his woodland
            trim.                                 --Sir W.
                                                  Scott.
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   2. Order; disposition; condition; as, to be in good trim. "
      The trim of an encounter." --Chapman.
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   3. The state of a ship or her cargo, ballast, masts, etc., by
      which she is well prepared for sailing.
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   4. (Arch) The lighter woodwork in the interior of a building;
      especially, that used around openings, generally in the
      form of a molded architrave, to protect the plastering at
      those points.
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   In ballast trim (Naut.), having only ballast on board. --R.
      H. Dana, Jr.

   Trim of the masts (Naut.), their position in regard to the
      ship and to each other, as near or distant, far forward or
      much aft, erect or raking.

   Trim of sails (Naut.), that adjustment, with reference to
      the wind, witch is best adapted to impel the ship forward.
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The Collaborative International Dictionary of English v.0.48:

Trim \Trim\, v. t. [imp. & p. p. Trimmed; p. pr. & vb. n.
   Trimming.] [OE. trimen, trumen, AS. trymian, trymman, to
   prepare, dispose, make strong, fr. trum firm, strong; of
   uncertain origin.]
   1. To make trim; to put in due order for any purpose; to make
      right, neat, or pleasing; to adjust.
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            The hermit trimmed his little fire.   --Goldsmith.
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   2. To dress; to decorate; to adorn; to invest; to embellish;
      as, to trim a hat.
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            A rotten building newly trimmed over. --Milton.
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            I was trimmed in Julia's gown.        --Shak.
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   3. To make ready or right by cutting or shortening; to clip
      or lop; to curtail; as, to trim the hair; to trim a tree.
      " And trimmed the cheerful lamp." --Byron.
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   4. (Carp.) To dress, as timber; to make smooth.
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   5. (Naut.)
      (a) To adjust, as a ship, by arranging the cargo, or
          disposing the weight of persons or goods, so equally
          on each side of the center and at each end, that she
          shall sit well on the water and sail well; as, to trim
          a ship, or a boat.
      (b) To arrange in due order for sailing; as, to trim the
          sails.
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   6. To rebuke; to reprove; also, to beat. [Colloq.]
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   To trim in (Carp.), to fit, as a piece of timber, into
      other work.

   To trim up, to dress; to put in order.
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            I found her trimming up the diadem
            On her dead mistress.                 --Shak.
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The Collaborative International Dictionary of English v.0.48:

Trim \Trim\, a. [Compar. Trimmer; superl. Trimmest.] [See
   Trim, v. t.]
   Fitly adjusted; being in good order., or made ready for
   service or use; firm; compact; snug; neat; fair; as, the ship
   is trim, or trim built; everything about the man is trim; a
   person is trim when his body is well shaped and firm; his
   dress is trim when it fits closely to his body, and appears
   tight and snug; a man or a soldier is trim when he stands
   erect.
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         With comely carriage of her countenance trim.
                                                  --Spenser.
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         So deemed I till I viewed their trim array
         Of boats last night.                     --Trench.
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WordNet (r) 3.0 (2006):

trim
    adj 1: thin and fit; "the spare figure of a marathon runner"; "a
           body kept trim by exercise" [syn: spare, trim]
    2: of places; characterized by order and neatness; free from
       disorder; "even the barn was shipshape"; "a trim little
       sailboat" [syn: shipshape, trim, well-kept]
    3: neat and smart in appearance; "a clean-cut and well-bred
       young man"; "the trig corporal in his jaunty cap"; "a trim
       beard" [syn: clean-cut, trig, trim]
    4: severely simple in line or design; "a neat tailored suit";
       "tailored curtains" [syn: tailored, trim]
    n 1: a state of arrangement or appearance; "in good trim" [syn:
         trim, trimness]
    2: a decoration or adornment on a garment; "the trimming on a
       hat"; "the trim on a shirt" [syn: trimming, trim,
       passementerie]
    3: attitude of an aircraft in flight when allowed to take its
       own orientation
    4: cutting down to the desired size or shape [syn: trim,
       trimming, clipping]
    v 1: remove the edges from and cut down to the desired size;
         "pare one's fingernails"; "trim the photograph"; "trim
         lumber" [syn: pare, trim]
    2: decorate, as with ornaments; "trim the christmas tree"; "trim
       a shop window"
    3: cut down on; make a reduction in; "reduce your daily fat
       intake"; "The employer wants to cut back health benefits"
       [syn: reduce, cut down, cut back, trim, trim down,
       trim back, cut, bring down]
    4: balance in flight by regulating the control surfaces; "trim
       an airplane"
    5: be in equilibrium during a flight; "The airplane trimmed"
    6: decorate (food), as with parsley or other ornamental foods
       [syn: trim, garnish, dress]
    7: cultivate, tend, and cut back the growth of; "dress the
       plants in the garden" [syn: snip, clip, crop, trim,
       lop, dress, prune, cut back]
    8: cut closely; "trim my beard" [syn: shave, trim]
    9: adjust (sails on a ship) so that the wind is optimally used

Moby Thesaurus II by Grady Ward, 1.0:

480 Moby Thesaurus words for "trim":
   Attic, Ciceronian, abbreviate, ability, abridge, abstain, abstract,
   adjoin, adjunct, adjustment, adorn, adornment, affix, all ataunto,
   anal, anchor, annex, apoise, apparel, arrange, arrangement, array,
   ataunt, athletic, attach, attire, bad condition, ballast, barber,
   be a timeserver, beat, beat all hollow, beat down, beat hollow,
   beautify, bedeck, bedizen, bedizenment, befringe, belay, best,
   bind, blazon, bob, boil down, border, bound, braw, break,
   break bulk, break out ballast, bungup and bilge-free, call down,
   capability, caparison, capsulize, cement, chaste, cheapen, chic,
   chipper, cinch, clamp, classic, classy, clean, clean up, clean-cut,
   clean-limbed, clear, clear for action, clear the decks, clear up,
   clinch, clip, clobber, clothes, clothes-conscious, clothing, coif,
   coiffure, color, color patterns, come down on, comely, commission,
   compact, competence, competency, compress, condense, condition,
   conk, contract, cop out, cosmopolitan, costume, cramp, crank,
   crank in, crisp, crop, cure, curtail, cut, cut back, cut down,
   cut off short, cut prices, cut short, dandify, dapper, dashing,
   deck, deck out, decline, decor, decorate, decoration, defeat,
   deflate, deploy, depreciate, destroy, devaluate, dinky, direct,
   dive, dizen, do in, dock, doll up, drapery, draw in, draw taut,
   dress, dress down, dress up, dressed to advantage, dressing, drub,
   duck the issue, duds, easy, edge, edging, elaboration, elegant,
   elide, embellish, embellishment, emblazon, emblazonment,
   emblazonry, embroider, embroidery, enframe, engraft, enrich,
   epitomize, evade, evade the issue, exquisite, fall, fall in price,
   fashion, fasten, fatigues, feathers, fettle, fig, fig out,
   finished, fit, fitness, fittedness, fix, fix up, flax, flourish,
   flower arrangement, foreshorten, form, frame, frill, fringe,
   furbish, furniture arrangement, garb, garments, garnish,
   garnishment, garniture, gear, genteel, get ready,
   give a dressing-down, give it to, give way, good condition, grace,
   graceful, gracile, graft, grapple, groom, guise, gussy up,
   habiliment, habit, health, hem, hide, hors de combat, illumination,
   in trim, investiture, investment, jaunty, jew down, jump all over,
   jump on, kilter, knit, lambaste, lap, larrup, lather, leather,
   lick, limpid, line, linen, list, lower, lucid, make arrangements,
   make fast, make preparations, make ready, march, marge, margin,
   marginate, mark down, marshal, mastery, maturity, mobilize, moor,
   mow, natty, natural, neat, neaten, nifty, nip, nobby, nose-dive,
   order, orderly, ornament, ornamentation, outclass, outdo, outfight,
   outgeneral, outmaneuver, outpoint, outrun, outsail, outshine,
   paddle, paint, pare, pellucid, perspicuous, piping, plain, plan,
   plummet, plunge, police, police up, polished, poll, pollard,
   pompadour, posh, prank, prank up, prearrange, preen, prep, prepare,
   preparedness, pretreat, prettify, primp, primp up, prink, prink up,
   process, proficiency, provide, prune, pull in, pure, purfle, purl,
   put, put in shape, put in trim, put to, qualification, rags,
   raiment, readiness, ready, ready up, reap, recap, recapitulate,
   recherche, redecorate, redo, reduce, reel, reel in, refined,
   refurbish, repair, restrained, retrench, rickrack, rim, ripeness,
   ritzy, robes, round, ruin, sag, screw up, seasoning, secure, set,
   set off, set out, set to, settle, settle preliminaries, shape,
   shapely, sharp, shave, shear, shellac, shift ballast, shingle,
   shipshape, shoot ballast, shorten, side, simple, sit it out, skin,
   skin alive, skirt, skive, slash, sleek, slender, slick, slim,
   slump, smart, smarten, smarten up, smear, smother, smug, snazzy,
   snip, snub, snug, soigne, soignee, sophisticated, speak to,
   spick and span, spick-and-span, spiffy, sportswear, spruce,
   spruce up, stand neuter, state, statuesque, straddle,
   straighten up, straightforward, streamlined, stunt, style,
   style-conscious, suitability, suitableness, suitedness, sum up,
   summarize, swank, swanky, swell, symmetrical, synopsize, tackle,
   take in, talk to, tan, tasteful, taut, tauten, telescope, tell off,
   tempering, temporize, terse, thrash, threads, tidy, tidy up, tight,
   tighten, titivate, togs, toilette, treat, trice up, trick out,
   trick up, tricksy, trig, trig up, trim ship, trim up, trimming,
   triumph over, trounce, truncate, try out, unaffected, uncluttered,
   undo, unlabored, verge, vestment, vesture, wallop, wave, wear,
   wearing apparel, well-cared-for, well-dressed, well-favored,
   well-formed, well-groomed, well-made, well-ordered,
   well-proportioned, well-shaped, welt, whack, whale, whip, winch,
   wind in, windlass, window dressing, wing out ballast, worst