Source : Webster's Revised Unabridged Dictionary (1913)

Swarm \Swarm\, v. t.
   To crowd or throng. --Fanshawe.

Swarm \Swarm\, v. i. [Cf. {Swerve}.]
   To climb a tree, pole, or the like, by embracing it with the
   arms and legs alternately. See {Shin}. [Colloq.]

         At the top was placed a piece of money, as a prize for
         those who could swarm up and seize it.   --W. Coxe.

Swarm \Swarm\, n. [OE. swarm, AS. swearm; akin to D. zwerm, G.
   schwarm, OHG. swaram, Icel. svarmr a tumult, Sw. sv["a]rm a
   swarm, Dan. sv[ae]rm, and G. schwirren to whiz, to buzz, Skr.
   svar to sound, and perhaps to E. swear. [root]177. Cf.
   {Swerve}, {Swirl}.]
   1. A large number or mass of small animals or insects,
      especially when in motion. ``A deadly swarm of hornets.''
      --Milton.

   2. Especially, a great number of honeybees which emigrate
      from a hive at once, and seek new lodgings under the
      direction of a queen; a like body of bees settled
      permanently in a hive. ``A swarm of bees.'' --Chaucer.

   3. Hence, any great number or multitude, as of people in
      motion, or sometimes of inanimate objects; as, a swarm of
      meteorites.

            Those prodigious swarms that had settled themselves
            in every part of it [Italy].          --Addison.

   Syn: Multitude; crowd; throng.

Swarm \Swarm\, v. i. [imp. & p. p. {Swarmed}; p. pr. & vb. n.
   {Swarming}.]
   1. To collect, and depart from a hive by flight in a body; --
      said of bees; as, bees swarm in warm, clear days in
      summer.

   2. To appear or collect in a crowd; to throng together; to
      congregate in a multitude. --Chaucer.

   3. To be crowded; to be thronged with a multitude of beings
      in motion.

            Every place swarms with soldiers.     --Spenser.

   4. To abound; to be filled (with). --Atterbury.

   5. To breed multitudes.

            Not so thick swarmed once the soil Bedropped with
            blood of Gorgon.                      --Milton.

Source : WordNet®

swarm
     n 1: a moving crowd [syn: {drove}, {horde}]
     2: a group of many insects; "a swarm of insects obscured the
        light"; "a cloud of butterflies" [syn: {cloud}]
     v 1: be teeming, be abuzz; "The garden was swarming with bees";
          "The plaza is teeming with undercover policemen"; "her
          mind pullulated with worries" [syn: {teem}, {pullulate}]
     2: move in large numbers; "people were pouring out of the
        theater"; "beggars pullulated in the plaza" [syn: {pour},
        {stream}, {teem}, {pullulate}]