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all of a sudden
01
in an unexpected or abrupt manner
02
happening unexpectedly
Example
All of a sudden, the storm rolled in, darkening the sky.
All of a sudden, the dog started barking loudly.
All of a sudden, the power went out, leaving the house silent.
He felt dizzy all of a sudden and had to sit down.
She burst into laughter all of a sudden, surprising everyone around her.
