Jisho

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Noun
1. cutting the New Year's rice cake (January 11th)
Noun
2. traditional breaking of a sake cask at weddings, receptions, etc.
Wikipedia definition
3. Kagami birakiKagami Biraki (鏡開き) is a Japanese traditional ceremony which literally translates to "Opening the Mirror" (from an abstinence) or, also, "Breaking of the Mochi. " It traditionally falls on January 11 It refers to the opening of a Kagami mochi, or to the opening of a cask of Sake at a party or ceremony.
Read “Kagami biraki” on English Wikipedia
Read “鏡開き” on Japanese Wikipedia
Read “Kagami biraki” on DBpedia

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