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Chinese
一旦 [yī​dàn]
in case (sth happens); if; once (sth happens, then...); when; in a short time; in one day
Japanese
一旦 いったん 同音
  1. adverb usually kana once
  2. adverb usually kana for a short time; briefly; temporarily
  3. noun archaic one morning
Notes
Example Sentences
🇯🇵 (2)
いったんしたことは元どおりにならない。
What is done cannot be undone.
いったん着地した怪物は、瞬間ふたたび跳躍して私の頭上にいた。
Having once landed the monster immediately jumped again and was over my head.
Japanese Names
一旦 いったん
Ittan place name
Contains
一
yī ひと- 일
one
旦
dàn あき.らか 단
dawn