大事 (dà shì) means “major event; major political event (war or change of regime); major social event (wedding or funeral); (do sth) in a big way”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Measure word: 件,桩
结婚是人生大事。
Jiéhūn shì rénshēng dàshì.
Marriage is a major event in life.
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