Source : Webster's Revised Unabridged Dictionary (1913)

Crowd \Crowd\ (kroud), v. t. [imp. & p. p. {Crowded}; p. pr. &
   vb. n. {Crowding}.] [OE. crouden, cruden, AS. cr?dan; cf. D.
   kruijen to push in a wheelbarrow.]
   1. To push, to press, to shove. --Chaucer.

   2. To press or drive together; to mass together. ``Crowd us
      and crush us.'' --Shak.

   3. To fill by pressing or thronging together; hence, to
      encumber by excess of numbers or quantity.

            The balconies and verandas were crowded with
            spectators, anxious to behold their future
            sovereign.                            --Prescott.

   4. To press by solicitation; to urge; to dun; hence, to treat
      discourteously or unreasonably. [Colloq.]

   {To crowd out}, to press out; specifically, to prevent the
      publication of; as, the press of other matter crowded out
      the article.

   {To crowd sail} (Naut.), to carry an extraordinary amount of
      sail, with a view to accelerate the speed of a vessel; to
      carry a press of sail.

Source : WordNet®

crowding
     n : a situation in which people or things are crowded together;
         "he didn't like the crowding on the beach"