The Collaborative International Dictionary of English v.0.48:

Collar \Col"lar\, v. t. [imp. & p. p. Collared; p. pr. & vb.
   n. Collaring.]
   1. To seize by the collar.
      [1913 Webster]

   2. To put a collar on.

   3. to arrest, as a wanted criminal. Same as put the collar
      on.
      [PJC]

   To collar beef (or other meat), to roll it up, and bind it
      close with a string preparatory to cooking it.
      [1913 Webster] collarbone

The Collaborative International Dictionary of English v.0.48:

Collar \Col"lar\, n. [OE. coler, coller, OF. colier, F. collier,
   necklace, collar, fr. OF. col neck, F. cou, fr. L. collum;
   akin to AS. heals, G. & Goth. hals. Cf. Hals, n.]
   1. Something worn round the neck, whether for use, ornament,
      restraint, or identification; as, the collar of a coat; a
      lady's collar; the collar of a dog.
      [1913 Webster]

   2. (Arch.)
      (a) A ring or cincture.
      (b) A collar beam.
          [1913 Webster]

   3. (Bot.) The neck or line of junction between the root of a
      plant and its stem. --Gray.
      [1913 Webster]

   4. An ornament worn round the neck by knights, having on it
      devices to designate their rank or order.
      [1913 Webster]

   5. (Zool.)
      (a) A ringlike part of a mollusk in connection with
          esophagus.
      (b) A colored ring round the neck of a bird or mammal.
          [1913 Webster]

   6. (Mech.) A ring or round flange upon, surrounding, or
      against an object, and used for restraining motion within
      given limits, or for holding something to its place, or
      for hiding an opening around an object; as, a collar on a
      shaft, used to prevent endwise motion of the shaft; a
      collar surrounding a stovepipe at the place where it
      enters a wall. The flanges of a piston and the gland of a
      stuffing box are sometimes called collars.
      [1913 Webster]

   7. (Naut.) An eye formed in the bight or bend of a shroud or
      stay to go over the masthead; also, a rope to which
      certain parts of rigging, as dead-eyes, are secured.
      [1913 Webster]

   8. (Mining) A curb, or a horizontal timbering, around the
      mouth of a shaft. --Raymond.
      [1913 Webster]

   Collar beam (Arch.), a horizontal piece of timber
      connecting and tying together two opposite rafters; --
      also, called simply collar.

   Collar of brawn, the quantity of brawn bound up in one
      parcel. [Eng.] --Johnson.

   Collar day, a day of great ceremony at the English court,
      when persons, who are dignitaries of honorary orders, wear
      the collars of those orders.

   To slip the collar, to get free; to disentangle one's self
      from difficulty, labor, or engagement. --Spenser.
      [1913 Webster]

WordNet (r) 3.0 (2006):

collar
    n 1: a band that fits around the neck and is usually folded over
         [syn: collar, neckband]
    2: (zoology) an encircling band or marking around the neck of
       any animal
    3: anything worn or placed about the neck; "the thief was forced
       to wear a heavy wooden collar"; "a collar of flowers was
       placed about the neck of the winning horse"
    4: a short ring fastened over a rod or shaft to limit, guide, or
       secure a machine part
    5: the stitching that forms the rim of a shoe or boot [syn:
       collar, shoe collar]
    6: a band of leather or rope that is placed around an animal's
       neck as a harness or to identify it
    7: necklace that fits tightly around a woman's neck [syn:
       choker, collar, dog collar, neckband]
    8: a figurative restraint; "asked for a collar on program
       trading in the stock market"; "kept a tight leash on his
       emotions"; "he's always gotten a long leash" [syn: collar,
       leash]
    9: the act of apprehending (especially apprehending a criminal);
       "the policeman on the beat got credit for the collar" [syn:
       apprehension, arrest, catch, collar, pinch, taking
       into custody]
    v 1: take into custody; "the police nabbed the suspected
         criminals" [syn: collar, nail, apprehend, arrest,
         pick up, nab, cop]
    2: seize by the neck or collar
    3: furnish with a collar; "collar the dog"

Moby Thesaurus II by Grady Ward, 1.0:

236 Moby Thesaurus words for "collar":
   Oregon boat, Roman collar, anklet, apprehend, appropriate, armlet,
   armory, arrest, back band, backstrap, badge, badge of office,
   badges, bag, band, bandanna, baton, bearing rein, bellyband, belt,
   bertha, bilbo, bit, blazonry, blinders, blinds, boa, bond, bonds,
   bottle up, bowtie, bracelet, brassard, breakers, breeching, bridle,
   bust, button, button-down collar, cabbage, camisole, cap and gown,
   caparison, capture, cavesson, celluloid collar, chain,
   chain of office, chains, checkrein, cheekpiece, chinband, choke,
   choker, cinch, cincture, cingulum, class ring, clerical collar,
   clout, cockade, collarband, comforter, cop, cravat, cross,
   crownband, crupper, cuffs, curb, decoration, dog collar, dress,
   eagle, earring, ecliptic, emblems, ensigns, equator, fasces,
   fascia, fetter, figurehead, fillet, finger ring, fleur-de-lis,
   foam, four-in-hand, froth, fur, gag, gag swivel, get, girdle, girt,
   girth, grab, great circle, guimpe, gyves, hackamore, halter, hames,
   hametugs, hammer and sickle, hamper, handcuffs, harness, head,
   headgear, headstall, heraldry, hip straps, hobbles, hook, hoop,
   hopples, insignia, irons, jaquima, jerk line, kerchief, lapel pin,
   lather, leading strings, leash, lift, lines, livery, mace,
   make a pinch, manacle, mantle, markings, martingale, medal,
   meringue, mortarboard, mousse, muffler, muzzle, nab, nail,
   neckband, neckcloth, neckerchief, necklace, neckpiece, necktie,
   nip, nose ring, noseband, offscum, old school tie, pick up,
   pillory, pin, pinch, plunging neckline, pole strap, puff, pull in,
   put under arrest, quoit, regalia, reins, restraint, restraints,
   ribbons, ring, rose, ruff, run in, saddle, scarf, school ring,
   scud, scum, sea foam, secure, shackle, shaft tug, shamrock,
   side check, sigillography, skull and crossbones, snaffle, soapsuds,
   souffle, sphragistics, spindrift, spoondrift, spray, spume, staff,
   steal, stinging, stock, stocks, stole, straightjacket,
   strait-waistcoat, straitjacket, stranglehold, suds, surcingle,
   surf, swastika, tack, tackle, take, take in, take into custody,
   take prisoner, tallith, tartan, tether, thistle, tie, tippet,
   trammel, trammels, trappings, tree, tucker, tug, uniform, verge,
   wand, white water, winker braces, wristband, wristlet, yoke,
   zodiac, zone



Easton's 1897 Bible Dictionary:

Collar
   (Heb. peh), means in Job 30:18 the mouth or opening of the
   garment that closes round the neck in the same way as a tunic
   (Ex. 39:23). The "collars" (Heb. netiphoth) among the spoils of
   the Midianites (Judg. 8:26; R.V., "pendants") were ear-drops.
   The same Hebrew word is rendered "chains" in Isa. 3:19.