in the driver's seat
US /ɪn ðə ˈdraɪ.vɚz ˌsiːt/
UK /ɪn ðə ˈdraɪ.vɚz ˌsiːt/

1.
掌握主導權, 處於主導地位
in control of a situation
:
•
After the merger, our company is finally in the driver's seat.
合併後,我們公司終於掌握了主導權。
•
She likes to be in the driver's seat when it comes to planning events.
在策劃活動方面,她喜歡掌握主導權。