“In a flash” in Japanese
Short answer
In a flash in Japanese is “秒で” (byoude). Full meaning: in an instant, in a flash, right away, immediately.
Other ways to say “In a flash” in Japanese
瞬く間に
matatakumani in the twinkling of an eye, in a flash
あっという間に
attoiumani in an instant, in a flash, in the blink of an eye, in no time at all, just like that
礑と
hatato suddenly (hit), with a slap; sharply (glance, glare, etc.), fiercely; suddenly, all of a sudden, in a flash
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