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1. The last meal that Jesus shared with his disciples before his crucifixion, which some Christians believe instituted the sacrament of the Eucharist. Usually capitalized in this usage. We celebrate the Last Supper by going to Mass on Holy Thursday.
2. The last meal before something significant. A: "Thanks for coming to my last supper." B: "Oh, stop! I'm sure your surgery tomorrow will go fine." I can't believe this is my last supper as a single guy!