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in a flash

in a flash

35 2.5
Very quickly in a single moment
  • idiom
  • Informal
translation icon : en un instante
  • One minute he is on the house and in a flash, he is beside me.
  • go in a flash
  • come in a flash

Obviously they come in a flash, bow grab me.

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Examples

  • She completed the project in a flash, impressing her boss.

  • Sam felt a moment's disappointment, but it was gone in a flash.

    Fiction book (1993)
  • We'll be in there in a flash - oh, look at that view.

  • Right, we'll be back in a flash.

  • And in a flash, that summer had changed our lives.

  • Okay, stay here, I'll be back in a flash.

  • Because my kids will be grown up in a flash, and I will have missed it.

  • I realised in a flash that I love him.

  • Word spread in a flash among the residents of Dream Street Shopping Arcade.

    Fiction book (1996)
  • But another had carefully watched her—and in a flash, Keane understood what the princess attempted.

    Fiction book (1992)

Synonyms

fast
vsin a flash
1.0

Moving or happening quickly

is more specific to sudden instant action rather than general high speed
quickly
vsin a flash
1.0

At a fast speed or without delay

is often used for general speed and can include sudden instant events
suddenly
vsin a flash
1.0

Quickly and without warning

is the neutral phrase for instant occurrence, not only unexpectedness
immediately
vsin a flash
1.0

At once without waiting

is equivalent in being done without delay but can also stress sudden surprise
all of a sudden
vsin a flash
  • Informal
987 2.7

Very quickly and without warning

is the plain description of instant change rather than that exact idiom
rapidly
vsin a flash
446 1.4

In a very short time

is similar but also highlights suddenness or immediate appearance sometimes
at once
vsin a flash
344 1.0

Immediately without delay

is similar but can also imply a quick suddenness rather than urgent duty
instantly
vsin a flash
330 1.0

Right away without any delay

is similar but often sounds more vivid and sudden in everyday speech
in no time
vsin a flash
174 1.3

Very quickly, in a short time

is often used for quick results rather than instant sudden events
abruptly
vsin a flash
145 3.3

In a sudden way that gives no warning

is similar but can also mean quickness without the emphasis on surprise
quick
vsin a flash
  • Informal
130 1.0

Happening or done without any delay

focuses more on very short sudden moments rather than mere promptness
on the spot
vsin a flash
121 2.8

Immediately at the exact place where something happens, often needing a quick response

is about instantness generally, not necessarily tied to location or place
of a sudden
vsin a flash
  • Informal
116 7.1

Happens quickly and without warning

is the fuller phrase emphasizing rapid unexpectedness rather than gradual change
swiftly
vsin a flash
84 1.0

Quickly and smoothly

is also fast but can stress abruptness instead of smooth motion
in a heartbeat
vsin a flash
  • Informal
50 3.2

Right away without any hesitation

is the neutral expression of instant action without emotional nuance
in the blink of an eye
vsin a flash
  • Informal
50 3.3

Very quickly, in almost no time

is the general way to describe speed without that strong visual picture
instantaneously
vsin a flash
25 5.6

Happen at once without delay

is equally immediate but carries a common spoken tone rather than technical force
all at once
vsin a flash
13 3.0

Happening suddenly and without warning

is used for single instant events but also for simultaneous multiple actions
speedily
vsin a flash
6 2.4

To act quickly without delay

is the common term that adds a sense of sudden momentary action
like a shot
vsin a flash
  • Informal
4 6.0

Very quickly and without hesitation

is the general phrase for quickness, not always paired with movement
in a snap
vsin a flash
  • Informal
3 3.0

It happens very quickly with little effort

is about quickness that can be instant without stressing ease
lightning-quick
vsin a flash
2 4.2

Happens almost instantly

is more neutral, used for quickness without such dramatic comparison
in nothing flat
vsin a flash
  • Archaic
1 7.0

In a very short time

is similar but can also suggest suddenness rather than mere short duration
at lightspeed
vsin a flash
  • Informal
1 5.1

To happen or be done very quickly

is the normal expression used for instant events not needing hyperbole
in the wink of an eye
vsin a flash
  • Informal
1 3.5

Very quickly, in an instant

is the neutral phrase often used for sudden quick events rather than imagery
wink of an eye
vsin a flash
  • Informal
1 3.8

In a very short time

is the straightforward way to say very quick or sudden occurrence
quick as a flash
vsin a flash
  • Informal
1 2.0

Happen very fast

is the common phrase that also highlights suddenness in many contexts
like Speedy Gonzales
vsin a flash
  • Informal
1 8.0

In a very quick way, like someone running fast

is the basic description without relying on a cultural or humorous source
in the bat of an eye
vsin a flash
  • Informal
5.1

Very quickly, in almost no time

is similar but can also cover less dramatic quickness
in an eyeblink
vsin a flash
  • Informal
6.8

Happen very quickly in the short time it takes to blink an eye

is the usual phrase for instant action without focusing on physical image
in the snap of someone's fingers
vsin a flash
  • Informal
5.0

Happens very quickly

is similar but can be used when suddenness lacks implied ease
in jig time
vsin a flash
  • Archaic
7.9

In a very short time

is the general phrase that does not stress the playful timing implied
in quick sticks
vsin a flash
  • Archaic
9.9

Very quickly and in a hurry

is broader and can describe quickness without the rushed feeling
before you can say knife
vsin a flash
  • UK
9.9

It happens very quickly

is the neutral term for instant action without expressive idiomatic colouring
with a quickness
vsin a flash
  • Informal
7.2

In a very short time

is similar but can also mean suddenness without strong urgency

Antonyms

1.0

At a low speed without hurrying

273 1.9

Slowly and steadily over time

How Fast

instantaneous
35 5.1
in the blink of an eye
  • Informal
50 3.3
in a flash
  • Informal
35 2.5
quickly
1.0
slowly
1.0

Surface Forms

in a flash positive
in a flash positive

Morphology

in + a + flash

The meaning 'very quickly; in an instant' is directly derivable from the parts: 'flash' can mean a very short period and the pattern 'in a + time unit' yields 'within that brief moment'. This compositional temporal pattern is common across languages (e.g., Spanish 'en un instante'), so a B1 learner who knows the constituents will readily infer the meaning.

Etymology

In a flash comes from the sudden bright light of a flash, like lightning or a camera. That quick, bright moment is over almost at once, so the phrase means 'very quickly' or 'in an instant'.