Verb cheer up has 2 senses
  1. cheer, cheer up, jolly along, jolly up - cause (somebody) to feel happier or more cheerful; "She tried to cheer up the disappointed child when he failed to win the spelling bee"
    Sample sentence:
    The good news will cheer up her
  2. cheer, cheer up, chirk up - become cheerful
    --2 is one way to rejoice, joy
    Sample sentence:
    Somebody ----s
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