A FLASH

Albanian

sa hap e mbyll sytë (in a flash, in the twinkle, in the twinkling of an eye). (various references)

Czech

bleskovì (in a flash). (various references)

Finnish

vilahduksessa (in a flash). (various references)

German

im nu (in no time, trice), blitzschnell (in a flash, lickety-split, lightning, like lightning, smart, smartly, split second). (various references)

Greek 

με μίας (in a flash), αστραπιαία (in a flash, sudenly), αστραπαία (in a flash). (various references)

Hebrew 

כהרף עין (in a flash, in no time, in two shakes). (various references)

Hungarian

szellemi sziporka (a flash of wit, flash of wit, sally, sally of wit, spark of wit), szalmaláng (flash in the pan), egy pillantás alatt (in a flash), ötletes bemondás (a flash of wit, flash of wit). (various references)

Japanese Kanji 

一閃 . (various references)

Japanese Katakana 

いっせん (a battle, a bout, a game, a line, one thousand, thoroughly wash away). (various references)

Pig Latin

aay ashflay.(various references)

Romanian

strãlucire de fulger (a flash of lightning), scânteiere de spirit (a flash of wit), licãrire de speranţã (a flash of hope), clipã (a flash of wit, hour, instant, juncture, minute, moment, point, second, tick, trice, wink). (various references)

Russian 

категорически отказываться (give a flash denial), мгновенно (in a flash, in a trice), мигом (at the double, in a flash, in the twinkle). (various references)

Scottish

plath , pladh, pladhadh (sudden blaze). (various references)

Serbo-Croatian

u magnovenju (flash: in a flash). (various references)

Spanish

en un instante (in a flash), como un relámpago (as quick as a flash). (various references)

Swedish

på en ögonblick (in a flash), blixtsnabbt (in a flash, like lightning). (various references)

Turkish

aniden (in a flash), kaşla göz arasında (before you could say jack robinson, in a flash, in a jiffy, in a tick, in a wink, in the twinkle of an eye, in the twinkling of an eye, in two ticks, like winking), birdenbire (abruptly, all at once, all of a sudden, at once, in a flash, on a sudden, out of clear sky, suddenly), bir anda (in a flash, in a jiffy, in a tick, in a trice, in a wink, on a sudden), bir an için (for a flash, for a moment, momentarily, momently). (various references)

Ukrainian

миттю (in a flash, in a jiffy). (various references)