其れまで
  それ迄
  其れ迄
  其迄
  irregular okurigana usage
  それまで
  Expressions (phrases, clauses, etc.)
  word usually written using kana alone
  until then
  till then
  up to that time
  word usually written using kana alone
  to that extent
  word usually written using kana alone
  the end of it
  all there is to it
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