quick as a flash
• very quickly.
• "quick as a flash he was at her side"
in a flash
• very quickly; immediately.
• "she was out of the back door in a flash"
Similar:
instantly,
suddenly,
abruptly,
immediately,
instantaneously,
all of a sudden,
quickly,
rapidly,
swiftly,
speedily,
without delay,
in an instant,
in a moment,
in a (split) second,
in a minute,
in a trice,
like a shot,
straight away,
in a wink,
in the blink of an eye,
in the twinkling of an eye,
before you know it,
on the double,
at the speed of light,
like an arrow from a bow,
in a jiffy,
double quick,
in double quick time,
p.d.q. (pretty damn quick),
like (greased) lightning,
at warp speed,
