Source : Webster's Revised Unabridged Dictionary (1913)

Mob \Mob\, v. t. [imp. & p. p. {Mobbed}; p. pr. & vb. n.
   {Mobbing}.]
   To crowd about, as a mob, and attack or annoy; as, to mob a
   house or a person.

Source : WordNet®

mob
     v : press tightly together or cram; "The crowd packed the
         auditorium" [syn: {throng}, {pack}, {pile}, {jam}]
     [also: {mobbing}, {mobbed}]

mob
     n 1: a disorderly crowd of people [syn: {rabble}, {rout}]
     2: a loose affiliation of gangsters in charge of organized
        criminal activities [syn: {syndicate}, {crime syndicate},
        {family}]
     3: an association of criminals; "police tried to break up the
        gang"; "a pack of thieves" [syn: {gang}, {pack}, {ring}]
     [also: {mobbing}, {mobbed}]

mobbing
     See {mob}