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Verb: jolly up
Usage: informal
  1. Cause (somebody) to feel happier or more cheerful
    "She tried to jolly up the disappointed child when he failed to win the spelling bee";
    - cheer, cheer up, jolly along [informal], buck up [informal], jolly [informal]

Derived forms: jollying up, jollied up, jollies up

Type of: encourage