Why do people use "mob" to refer to a single enemy?

n. 1. A large disorderly crowd or throng. See Synonyms at crowd1.

2. The mass of common people; the populace.

3. Informal a. An organized gang of criminals; a crime syndicate.

b. often Mob Organized crime. Often used with the: a murder suspect with links to the Mob.

4. An indiscriminate or loosely associated group of persons or things: a mob of boats in the harbor.

5. Australian A flock or herd of animals.

tr.v. mobbed, mob·bing, mobs 1. To crowd around and jostle or annoy, especially in anger or excessive enthusiasm: Eager fans mobbed the popular singer.

2. To crowd into: Visitors mobbed the fairgrounds.

3. To attack in large numbers; overwhelm: The quarterback was mobbed by the defensive line.

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