Meaning of “buck (sb/sth) up” in the English Dictionary

british dictionary

"buck (sb/sth) up" in British English

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buck (sb/sth) up

UK informal
phrasal verb with buck uk /bʌk/ us /bʌk/ verb [ I ]

to become happier or more positive or to make someone happier or more positive:

Oh, buck up for heaven's sake, Anthony! I'm sick of looking at your miserable face.
She was told that if she didn't buck her ideas up (= start working in a more positive way), she'd be out of a job.
A week at the beach will buck her up.

(Definition of “buck (sb/sth) up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)