いちだいじ
Noun
1.
important matter, matter of great importance, serious affair, major incident, emergency
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彼の結婚は家族にとって一大事だった。
His marriage was a matter of great importance for the family.
その国の経済危機は、世界全体にとって一大事となりうる。
That country's economic crisis could become a major incident for the entire world.
子供が熱を出して、私にとっては一大事だった。
My child had a fever, and it was a serious matter for me.
プロジェクトの締め切りが迫っており、これは一大事だ。
The project deadline is approaching, and this is a serious matter.
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