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Definition of buck up phrasal verb from the Oxford Advanced Learner's Dictionary

buck up

phrasal verb
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buck up (informal)
  1. (often in orders) to become more cheerful synonym cheer up
    • Buck up, kid! It's not the end of the game.
  2. buck up!
    (old-fashioned) used to tell somebody to hurry synonym hurry
buck somebody up
  1. (British English, informal) to make somebody more cheerful synonym cheer up
    • The good news bucked us all up.
See buck up in the Oxford Advanced American Dictionary

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