buck (someone/something) up
phrasal verb with buck verb [ I ] uk/bʌk/ us/bʌk/
UK informal
（使）高兴起来;（使）振作起来
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. 噢，安东尼，看在老天的份上振作起来！我不愿看到你那副愁眉苦脸的样子。
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. 她被告知，如果工作再不积极点儿就会丢了饭碗。
A week at the beach will buck her up. 在海边住一星期会使她精神焕发的。