Where does “unflashing” come from?

unflashing (English) comes from English flashing, from English Flash, from Middle English flasshen.

unflashing (English): Not flashing

Definitions

  1. Not flashing

Ancestry of “unflashing”, step by step

unflashing traces back through two separate lines of ancestry.

via English flashing

StepLanguageWordMeaning
1EnglishflashingA sudden blazing or bursting, as of fire or...
2EnglishFlashA multimedia platform, most often used for adding animation and interactivity to webpages
3Middle Englishflasshen

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Middle English flasshen