Grammar Info
N2 Lesson 9: 18/19

一旦(いったん)
once …, if … for a short time, temporarily (stop), for now/the time being

一旦 can be rephrased to 一度 but not the other way around

Structure
一旦 + Verb[ば]
一旦 + Verb[たら]
一旦 + Verb +
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使用域 一般
Information
  • [Often used to express that once A happens, returning to the initial situation is not easy・A often has a nuance of being a temporary state, event]
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一旦(いったん)一戸建(いっこだ)てに住(す)めばアパートに戻(もど)れない。
Once you live in a stand-alone house, you won’t be able to go back to an apartment.
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一旦(いったん)いつのまにか健康(けんこう)を失(うしな)うなら健康(けんこう)の価値(かち)を理解(りかい)するでしょう。
Once you lose your health (without you noticing), you will understand its value.
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一旦(いったん)これをしたら残(のこ)りをAさんに任(まか)せてください。
Once you do this, please leave the rest to A-san.
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