A mob means a big group of people who come together. Often, these people are angry or noisy. They may cause trouble or fight.
The mob shouted and threw stones.
A mob gathered outside the town hall.
Mob also means a group of criminals who work together. Often, they do illegal things and use power to control areas.
The mob controlled the city streets.
The police arrested members of the mob.
To mob can mean to come close in large numbers to see or greet a famous person. The people surround that person in excitement.
Fans mobbed the movie star outside.
Reporters mobbed the celebrity at the event.
In nature, mobbing is when small animals or birds come together to attack a bigger animal to protect themselves.
Small birds mobbed the hawk in the tree.
Seagulls mobbed the fishing boat nearby.
Mob can mean a mobile phone, especially in informal spoken English. People sometimes say this to mean their cell phone.
I left my mob at home today.
She called me on her mob.
In plays or stories, a mob is a group of extra characters who act as a crowd. They help make the scene look busy or real.
The mob stood quietly in the background scene.
The play needed a mob for the market scene.