quick as a flash

adj, adv — 2 senses

quick as a flash

adj

Etymology In reference to the rapidity of flashes of lightning.

1

Idiomatic Extremely quick.

quick as a flash

adv

Etymology In reference to the rapidity of flashes of lightning.

1

Idiomatic Extremely quickly.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.