buck(sb/sth)up
—phrasal verbwithbuckverb[I]uk/bʌk/us/bʌk/
UKinformaltobecomehappieror morepositiveor to make someonehappieror morepositive
（使）高兴起来；（使）振作起来
Oh,buckup for heaven'ssake, Anthony! I'msickoflookingatyourmiserableface.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'tbuckherideasup(=startworkingin a morepositiveway), she'd be out of ajob.她被告知，如果工作再不积极点儿就会丢了饭碗。
Aweekat thebeachwillbuckher up.在海边住一星期会使她精神焕发的。