The idiom "all at once" is an adverb that is used to describe something that happens suddenly or unexpectedly. It is often used to indicate that something has happened quickly or unexpectedly. The phrase is used to describe a sudden change or development.
The phrase has its origin in the late 18th century and it was first used in the context of describing a sudden event or change. It has been widely used in literature and speech since then.

The phrase can be used in a number of different contexts. For example, it can be used to describe a sudden change in weather, a surprise announcement, or a sudden decision. It can also be used to describe a sudden feeling or emotion, such as shock or surprise.
"All of a sudden" is an idiomatic expression and works as a synonym of "all at once", which means abruptly, unexpectedly, and instantaneously. This phrase is also used to describe a sudden change or event that happens without warning, and it is often used to express surprise or shock.
Here are ten sample sentences using the idioms "all at once" and "all of a sudden":
All at once, the sky turned dark and it began to rain.
I was walking down the street, and all of a sudden, I saw my old friend.
She was doing well in the race, but all at once, she tripped and fell.
All of a sudden, the music stopped and the lights went out.
He was telling a story, and all at once, he forgot what he was saying.
All of a sudden, I realized I left my keys in the car.
The class was quiet, and all at once, a student shouted out the answer.
All of a sudden, my phone rang and I realized I had left it on silent.
The children were playing, and all at once, they heard a loud noise.
All at once, the wind picked up and the leaves started falling.
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