English Reference
noun · verb

mob

n. · v.
US /ˈmɑb/ UK /mˈɒb/ mob UK spelling mob's, mob's

  1. 01 B2 Upper Intermediate

    n.a large, noisy, and often violent group of people.

    n.a large or disorderly crowd of people, especially one intent on causing trouble or violence.

    Simple

    An angry mob gathered outside the courthouse to protest the decision.

    In context

    The police struggled to contain the mob as it surged toward the gates of the embassy during the height of the riots.

  2. 02 B2 Upper Intermediate Informal Law

    n.a group of people involved in organized crime, like the Mafia.

    n.a criminal organization or syndicate, specifically referring to the Mafia or similar groups.

    Simple

    He was arrested for his alleged connections to the local mob.

    In context

    Federal investigators spent years tracking the financial transactions of the mob before they finally secured enough evidence for an indictment.

  3. 03 C1 Advanced Slang Computing

    n.a monster or character in a video game that you have to fight.

    n.a non-player character (NPC) in a video game, typically one that is hostile and intended for combat.

    Simple

    The player was defeated after being surrounded by a large group of mobs.

    In context

    The game's difficulty spikes significantly when multiple high-level mobs spawn simultaneously in the dungeon.

  4. 04 B2 Upper Intermediate American EnglishDialect

    n.a group of animals, especially sheep, cattle, or kangaroos.

    n.a collective noun for a group of animals, particularly livestock or Australian wildlife.

    Simple

    A mob of kangaroos hopped across the road just as the sun was setting.

    In context

    The drover managed to keep the mob of cattle together despite the sudden thunderstorm that threatened to scatter them.

  5. 05 B2 Upper Intermediate

    v.to crowd around someone in a noisy or excited way.

    v.to crowd around or surround someone, either with hostile intent or out of intense admiration.

    Simple

    Fans began to mob the singer as soon as she stepped out of the car.

    In context

    Reporters continued to mob the witness, shouting questions and blocking his path to the waiting vehicle.

    swarmsurroundbesiege

Some 50,000 ceutíes (residents of Ceuta) recently took to the streets and a mob even stormed the migrants’ camp destroyed their shacks and threw their belongings into the sea or burned them.

The Local· 3 Sept 2026

They had not long sat down in the restaurant when they were dragged outside by a mob.

BBC News· 3 Sept 2026

Etymology 1

From Middle English mob, short for mobile, from Latin mōbile (vulgus) (“fickle (crowd)”).

Etymology 2

Alteration of mab.

Etymology 3

Clipping of mobile. The video-gaming sense is sometimes reported as an abbreviation of man or beast or of mobile object, but these are backronyms.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin mobile
Level C1 · Advanced
Frequency Common
Updated