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all of a sudden

all of a sudden

737 2.7
Very quickly and without warning
  • idiom
  • Informal
: de repente
  • I was studying when, all of a sudden, the lights went out.
  • then all of a sudden
  • all of a sudden, I realized
  • all of a sudden, I felt

Things just all of a sudden become clear.

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Examples

  • When students are asked to solve real-life issues, all of a sudden they have a 'need to know.'

    Academic text (2007)
  • What makes you say that all of a sudden?

  • Things just all of a sudden become clear.

  • It's just one day they were all of a sudden responsible for this child.

  • But when a person has both, then all of a sudden things begin to change.

  • Like all of a sudden things are not OK.

  • And you all of a sudden see it all.

  • What did I do to get so lucky all of a sudden?

    Academic text (2009)
  • All of a sudden I feel very hungry.

  • "Grandfather, I feel ill all of a sudden." "You are not permitted to feel ill," he said.

    Fiction book (1991)

Synonyms

suddenly
vsall of a sudden
∞ 1.0

Quickly and without warning

stresses the lack of warning rather than just speed
of a sudden
vsall of a sudden
  • Informal
743 7.1

Happens quickly and without warning

highlights the unexpected aspect rather than the single event
just like that
vsall of a sudden
  • Informal
199 4.2

Happens suddenly without warning or effort

focuses more on its unexpectedness than on simplicity of action
out of nowhere
vsall of a sudden
194 4.2

Happening suddenly without any warning

highlights rapid occurrence in addition to coming unexpectedly
out of the blue
vsall of a sudden
  • Informal
111 3.4

Something happens suddenly and without warning

stresses the speed and suddenness as well as the surprise
abruptly
vsall of a sudden
108 3.3

In a sudden way that gives no warning

focuses more on happening without warning than on abruptness
unexpectedly
vsall of a sudden
91 2.3

Happening without any warning

adds the idea that it happens very quickly as well
from nowhere
vsall of a sudden
33 4.1

Suddenly and without any warning

adds that it also happens very quickly once it appears
in a flash
vsall of a sudden
  • Informal
32 2.5

Very quickly in a single moment

adds the idea of being unexpected rather than only instant speed
out of thin air
vsall of a sudden
28 5.8

Suddenly with no clear reason, like magic

is less about magic and more about quick unexpected occurrence
all at once
vsall of a sudden
25 3.0

Happening suddenly and without warning

puts more weight on being surprising than on simultaneous action
in the blink of an eye
vsall of a sudden
  • Informal
24 3.3

Very quickly, in almost no time

emphasizes surprise or lack of warning beyond mere instant timing
one fell swoop
vsall of a sudden
14 7.6

A single sudden action that happens all at once

is more general about suddenness rather than a single sweeping act
unawares
vsall of a sudden
8 7.2

Happens suddenly without you expecting it

adds that the event also occurs very fast and without warning
in the wink of an eye
vsall of a sudden
  • Informal
1 3.5

Very quickly, in an instant

adds that the event comes without prior warning or expectation
joltingly
vsall of a sudden
1 7.8

In a sudden, rough way that shocks or surprises

focuses more on suddenness without implying bodily shock or force

Antonyms

228 1.9

Slowly and steadily over time

29 3.4

In a way people expect

How Sudden

instantly
310 1.0
all of a sudden
  • Informal
737 2.7
gradually
228 1.9
slowly
∞ 1.0

Surface Forms

all of a sudden positive

Morphology

all + of + a + sudden

The core meaning 'unexpectedly/suddenly' is directly signaled by the adjective 'sudden', while 'all of a' functions as an intensifying quantifier, so a learner who knows the constituents can compose the adverbial sense. This is a common, compositional English pattern (equivalent to simple adverbs like 'suddenly') and is cross-linguistically transparent, making it accessible to B1 learners.

Etymology

The phrase all of a sudden puts together all, meaning 'everything', and sudden, meaning 'quick', creating the picture of everything happening at once. That's why it means 'very quickly and without warning'.