Definition of "cheer up" [cheer up]

• To become happy (verb)
• To make someone happy (verb)
• An encouragement (interjection)

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• "I often tell the old stories in which d'Elbene, de Charleval, and the Chevalier de Riviere cheer up the “moderns.”"
• "He sent Poplicola to Rome to cheer up his seven hundred senators, and Furnius to govern Asia Province."