English

aflash

From a- + flash.

Formed from a- + flash

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

Proto-West Germanic *uʀ- ‘up, out, over’

English a-

Middle English flasshen ‘to splash’

English flash

Today it means

adj Flashing.

Language periods are conventional ranges, not dates for this word.