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Verb: roister  roy-stu(r)
  1. Engage in boisterous, drunken merrymaking
    "They were out roistering last night";
    - carouse, riot

Derived forms: roistering, roisters, roistered

Type of: jollify, make happy, make merry, make whoopee [informal], racket, revel, wassail [archaic], whoop it up [informal]