一いち時どきに

adverb

all at once; at the same time; simultaneously

Describes multiple things happening or being done at the same moment, often with a sense of suddenness or concentration. Commonly used with verbs like 来る, 起こる, 言う, 押し寄せる.

• 注ちゅう文もんが一いち時どきに来きて、店みせは大だい混こん乱らんだった。

  Orders came in all at once, and the shop was in chaos.

• みんなが一いち時どきに話はなし始はじめたので、何なにも聞きき取とれなかった。

  Everyone started talking at the same time, so I couldn't catch anything.