Where does “flashmob” come from?

flashmob (English) comes from English mob, from English mobile, from Latin mōbilis, from Latin -bilis, from Proto-Italic -ðlis, from Proto-Indo-European -dʰlis, from Proto-Indo-European -dʰlom — Alternative form of *-trom; instrumental suffix;...

flashmob (English): Alternative spelling of flash mob

Definitions

  1. Alternative spelling of flash mob

Ancestry of “flashmob”, step by step

flashmob traces back through two separate lines of ancestry.

via English mob

StepLanguageWordMeaning
1EnglishmobA large or disorderly group of people; especially...
2EnglishmobileCapable of being moved, especially on wheels;...
3Latinmōbilismovable, loose
4Latin-bilis-ble
5Proto-Italic-ðlisForms adjectives from verb stems indicating capacity or worth of being acted on
6Proto-Indo-European-dʰlis
7Proto-Indo-European-dʰlomAlternative form of *-trom; instrumental suffix;...

via English Flash

StepLanguageWordMeaning
1EnglishFlashA multimedia platform, most often used for adding animation and interactivity to webpages
2Middle Englishflasshen
Every word from Proto-Indo-European -dʰlom
flashmob — Etymology, Origin & Word History | Etymology Explorer