American English

Definition of buck up phrasal verb from the Oxford Advanced American Dictionary

 

buck up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

buck up

(informal)
 
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(often in orders) to become more cheerful synonym cheer up Buck up, kid! It's not the end of the game.

buck somebody up

(informal)
 
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to make someone more cheerful synonym cheer up The good news bucked us all up.
See the Oxford Advanced Learner's Dictionary entry: buck up