INSTANTLY, suddenly, abruptly, immediately, all of a sudden; quickly, rapidly, swiftly, speedily; in an instant/moment, in a (split) second, in a trice, in the blink of an eye; informal in a jiffy, before you can say Jack Robinson.
2192; headword
IN A FLASH
Meaning of IN A FLASH in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012