all at once

IPA(Pronunciation)

Adverb

idiomatic not-comparable

Japanese Meaning

予期せずに、突然起こること / 一斉に、同時に起こること

He left the party all at once, and nobody knew why.

彼は突然パーティーを去り、誰も理由がわからなかった。

Sense（1）

(idiomatic) Unexpectedly; without warning; all of a sudden.

When all at once I saw a crowd, / A host, of golden daffodils

Sense（2）

Used other than figuratively or idiomatically: All at the same time; all together.

There are too many to get in the lift all at once, so some must wait.