She is bucking for a promotion.是什么意思？

She is bucking for a promotion.

她正在努力争取升职。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

bucking

v. （马等）猛然弓背跃起( buck的现在分词 )，抵制，猛然震荡，马等尥起后蹄跳跃；

例句
...two cowboys riding bucking broncos.
骑在弓背腾跃的野马上的两个牛仔

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

promotion

n. 促进，增进，提升，升级，（商品等的）推广，发扬；

例句
His job is the discovery and promotion of new artists.
他的任务就是发现并推出艺术新人。