gun for

To pursue relentlessly so as to overcome or destroy.

追逐，搜捕：全力追逐以便征服或毀滅

To go after in earnest; set out to obtain

竭力謀求：熱切地追求；著手去獲得

gunning for a promotion.

竭力爭取提升

big gun

(informal)an important or powerful person

(非正式)（重要的或有權力的）大人物

jump the gun

(informal)act before the proper or appropriate time

(非正式)在正常（或適當）的時間之前行動，過早行動

stick to one's guns

(informal)refuse to compromise or change, despite criticism

(非正式)拒絕妥協；堅持自己的立場

we have stuck to our guns on that issue.

在那個問題上我們堅持了自己的立場。

top gun

a (or the) most important person

頂級人物；最重要的人

the top guns in contention for the coveted post of chairman.

爭奪為眾人覬覦的主席之位的大佬們。

go great guns

To proceed or perform with great speed, skill, or success.

全速進行，大獲成功：以很快的速度、高超的技巧或巨大的成功從事或完成

under the gun

Under great pressure or under threat.

處于巨大的壓力或威脅之下