1. [late 17C+] the rabble, the city proletariat [SE f. 1800].
2. [early 19C+] a company or group of associates; occas. of non-human groups.
3. [mid-19C+] a criminal gang.
4. [mid-19C+] a gang of ruffians or thugs.
5. [1920s+] (US) constr. with the, the US Mafia.
6. [1990s+] by ext., e.g. in UK, any form of organized crime.
7. see mobster n.
[mid-19C] the phenomenon of the mob.
[1930s+] accompanied by a large gang.
[1930s] (Aus. Und.) a member of a criminal gang.